Biology Lab 7: Ecological Interactions

Your Full Name:

UMUC Biology 102/103

Lab 7: Ecological Interactions

INSTRUCTIONS:

 

· On your own and without assistance, complete this Lab 7 Answer Sheet electronically and submit it via the Assignments Folder by the date listed in the Course Schedule (under Syllabus).

· To conduct your laboratory exercises, use the Laboratory Manual located under Course Content. Read the introduction and the directions for each exercise/experiment carefully before completing the exercises/experiments and answering the questions.

· Save your Lab 7 Answer Sheet in the following format: LastName_Lab7 (e.g., Smith_Lab7).

· You should submit your document as a Word (.doc or .docx) or Rich Text Format (.rtf) file for best compatibility.

 

Pre-Lab Questions

1. Would you expect endangered species to be more frequently generalists or specialists? Explain your answer.

 

 

 

2. How does temperature affect water availability in an ecosystem?

 

 

 

3. Choose a species and describe some adaptations that species developed that allow them to survive in their native habitat.

 

 

 

Experiment 1: Effects of pH on Radish Seed Germination

Data Tables and Post-Lab Assessment

Table 1: pH and Radish Seed Germination

Stage/Day Observations Acetic Acid Sodium Bicarbonate Water
Initial pH      
1      
2      
3      
4      
5      
6      
7      

 

Take a picture of your results. Include a note with your name and date on an index card in the picture. Insert picture here:

 

Post-Lab Questions

1. Compare and construct a line graph based on the data from Table 1 in the space below. Place the day on the x axis, and the number of seeds germinated on the y axis. Be sure to include a title, label the x and y axes, and provide a legend describing which line corresponds to each plate (e.g., blue = acetic acid, green = sodium bicarbonate, etc
).

 

 

 

 

 

 

 

2. Was there any noticeable effect on the germination rate of the radish seeds as a result of the pH? Compare and contrast the growth rate for the control with the alkaline and acidic solutions.

 

 

 

3. According to your results would you say that the radish has a broad pH tolerance? Why or why not? Use your data to support your answer.

 

 

 

4. Knowing that acid rain has a pH of 2 – 3 would you conclude that crop species with a narrow soil pH range are in trouble? Explain why, or why not, using scientific reasoning. Is acid rain a problem for plant species and crops?

 

 

 

5. Research and briefly describe a real world example about how acid rain affects plants. Be sure to demonstrate how pH contributes to the outcome, and proposed solutions (if any). Descriptions should be approximately 2 – 3 paragraphs. Include at least three citations (use APA formatting).

 

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Sci 115 LIZARD EVOLUTION LAB QUIZ

Instructions

The questions on this lab quiz are based on “Module 2: Phylogeny” of the MMHI Lizard Evolution Virtual Lab. You may open the virtual lab, which will open in a separate tab, at the same time as you take the lab quiz. There is a 90 minute time limit. You may take the quiz two times, with your higher score counting towards your grade.

Complete the virtual lab module: “Module 2: Phylogeny” of the HHMI Lizard Evolution Virtual Lab at https://www.biointeractive.org/classroom-resources/lizard-evolution-virtual-lab Note: At this site, click on “Launch Interactives” and then run Module 2 (just Module 2; you don’t need to run any of the other other modules). The lab takes about 45 minutes. Lizard Evolution Virtual Lab instructions

Answer the quiz questions, below, which will take an estimated 10-15 minutes.

Results Displayed Submitted Answers

Question 1
8 out of 8 points
“According to the phylogenetic tree in this virtual lab, all anole lizards (genus Anolis) are more closely related to one another than they are to Leiocephalus carinatus”
Question 2
8 out of 8 points
“Based on this phylogeny, lizards of the same body type tend to be more closely related to one another than to lizards of different body types? ” Selected Answer:
Question 3
8 out of 8 points
“In general, lizards on the same island are more closely related to one another than to similar-looking lizards from other islands? ” Selected
Question 4
8 out of 8 points
The phylogentic tree is most consistent with which of the following hypotheses:
Question 5
8 out of 8 points
Which of the following statements is supported by the evidence from the tree?
Question 6
8 out of 8 points
Which of the following statements is supported by the evidence from the tree?
Question 7
7 out of 7 points
“According to Dr. Losos, the independent evolution of similar species on the different islands is an example of which of the following processes? ” S

MAY 2003 669

S URELY WE’VE all heard people say there is only one race — the human race. We’ve also heard and seen overwhelming evidence that would seem to contradict this view. After all, the U.S. Census di- vides us into groups based on race, and there are c e rtainly observable physical differences among p e o p l e — skin color, nose and eye shape, body type, hair color and texture, and so on. In the world of

education, the message of racial differences as biological “f a c t s” is re- i n f o rced when we are told that we should understand specific learn- ing styles and behavior patterns of black, Asian, Native American, white, and Latino children and when books such as The Bell Cu rve make pseudoscientific claims about race and learning.1

How can educators make sense of these conflicting messages about race? And why should they bother? Whether we think of all human beings as one

race, or as four or five distinct races, or as hundreds of races, does anything really change? If we accept that the con- cept of race is fundamentally flawe d , does that mean that young African Americans are less likely to be followe d by security guards in department store s ? A re people going to stop thinking of Asians as the “m o d e l” minority? Wi l l racism become a thing of the past?

How Real Is Race? Using Anthropology to Make Sense Of Human Diversity Race is not a scientifically valid biological category, and yet it re m a i n s i m p o rtant as a socially constructed category. Once educators grasp this concept, they can use the suggestions and re s o u rces the authors off e r h e re to help their students make sense of race.

BY CAROL MUKHOPADHYAY AND ROSEMARY C. HENZE

CAROL MUKHOPADHYAY is a professor in the Department of Anthropology, San José State University, San José, Calif., where ROSEMARY C. HENZE is an associate pro- fessor in the Department of Linguistics and Language Development. They wish to thank Gilberto Arriaza, Paul Erickson, Alan Good- man, and Yolanda Moses for their comments on this article.

 

 

670 PHI DELTA KAPPAN

Many educators understandably would like to have clear information to help them teach students about hu- man biological va r i a b i l i t y. While mul- ticultural education materials are now widely available, they rarely address basic questions about why we look dif- f e rent from one another and what these biological differences do (and do not) mean. Multicultural education empha- s i zes respecting differences and finding ways to include all stu- dents, especially those who h a ve been historically mar- g i n a l i zed. Multicultural ed- ucation has helped us to un- derstand racism and has pro- vided a rich body of litera- ture on antiracist teaching strategies, and this has been all to the good. But it has not helped us understand the two concepts of race: the biological one and the social one.

In this article, we explain what anthropologists mean when they say that “races don’t exist” (in other words, when they reject the concept of race as a scientifically valid biolog- ical category) and why they argue in- stead that “race” is a socially con- structed category. We’ll also discuss why this is such an important under- standing and what it means for edu- cators and students who face the so- cial reality of race and racism every d a y. And finally, we’ll offer some sug- gestions and resources for teachers who want to include teaching about race in their classes.

WHY RACE ISN’T B I O L O G I CA L LY REAL

For the past several decades, bio- logical anthropologists have been ar- guing that races don’t really exist, or, more precisely, that the concept of race has no validity as a biological cat-

egory. What exactly does this mean? First, anthropologists are unrav-

eling a deeply embedded ideology, a long-standing European and Amer- ican racial world view.2 Historically, the idea of race emerged in Europe in the 17th and 18th centuries, coin- ciding with the growth of colonial- ism and the transatlantic slave trade. Attempts were made to classify hu- mans into “natural,” geographically

distinct “races,” hierarchically ord e re d by their closeness to God’s original forms. Europeans were, not surpris- ingly, at the top, with the most per- fect form represented by a female skull from the Caucasus Mountains, near the purported location of No ah’s a rk and the origin of humans. He n c e the origins of the racial term “Cau- casian” or “Caucasoid” for those of European ancestry.3

In the late 19th century, anthro- pologists sought to reconstruct hu- man prehistory and trace the evolu- tion of human cultural institutions. Physical and cultural evolution were seen as moving in tandem; “advanc- es” in human mental capacity were thought to be responsible for human cultural inventions, such as marriage, family, law, and agriculture. If cul- tural “e vo l u t i o n” was propelled by bi- ological evolution, according to this logic, the more “advanced” cultures

must be more biologically and intel- lectually evo l ved. Physical indicators of evo l u t i o n a ry rank, such as skull size , were sought in order to classify and rank human groups along an evolu- tionary path from more “primitive” to more “advanced” races.

Ni n e t e e n t h – c e n t u ry Eu ropean sci- entists disagreed on when the “races” began. Theologians had long argued that there was “one human origin,”

Adam and Eve, and that certain races subsequently “d e g e n e r a t e d” (pre d i c t a b l y, the non-Eu ropeans). So m e e vo l u t i o n a ry scientists, how- e ve r, began to argue for mul- tiple origins, with distinct races evolving in different places and times. By the be- ginning of the 20th century, Eu ropean and American sci- ence viewed races as natural, long-standing divisions of the human species, evolv- ing at different rates bio-

logically and hence culturally. By such logic was racial inequality naturalize d and legitimized.

When contemporary scientists, in- cluding anthropologists, assert that races are not scientifically valid, they a re rejecting at least three fundamen- tal premises of this old racial ideol- ogy: 1) the archaic subspecies concept, 2) the divisibility of contemporary humans into scientifically valid bio- logical groupings, and 3) the link be- t ween racial traits and social, cultur- al, and political status.

1. There were no distinct, archaic human subspecies. The first premise a n t h ropologists reject is that humans we re originally divided, by nature or God, into a small set of biologically distinct, fixed species, subspecies, or races. Anthropologists now know con- clusively, from fossil and DNA evi- dence, that contemporary humans are one variable species, with our roots

For the past several decades, biol o g i c a l

a n t h ropologists have been a rguing that the concept of

race has no validity as a biological category.

 

 

MAY 2003 671

in Africa, which moved out of Africa into a wide range of environments around the world, producing hun- d reds, perhaps thousands, of cultur- ally and genetically distinct popula- tions. Local populations, through nat- ural selection as well as random ge – netic mutation, acquired some dis – t i n c t i ve genetic traits, such as shove l – shaped incisor teeth, hairy ears, or re d h a i r. Adaptation to human cultural in- ve n t i o n s — such as agriculture, which creates concentrations of water that allow malaria-carrying mosquitoes to bre e d — also produced higher fre- quencies of sickle-cell genes (related to malaria resistance) in human pop- ulations in some parts of Africa, In- dia, Arabia, and the Me d i t e r r a n e a n .4

At the same time, continuous migra- tion and intermating between local pop- ulations pre vented us from branching off into distinct subspecies or species and instead created a richer and more variable gene pool, producing new combinations and permutations of the human genome.

Human pre h i s t o ry and history, then, are a continuing story of fusion and fission, of a myriad of populations, emerging and shifting over time and space, sometimes isolated temporari- l y, then fusing and producing new for- mations. There have been thousands and thousands of groups thro u g h o u t

human history, marrying in and, more often, out; they have disappeared and reemerged in new forms over time.

In short, there are no “basic” or “ancient” races; there are no stable, “natural,” permanent, or even long- standing groupings called races. T h e re h a ve never have been any “p u re” races. All human populations are histori- cally specific mixtures of the human gene pool. This is human evolution, and we see these same processes at work in the 19th and 20th centuries and today. “Races” are ephemeral — here today, gone tomorrow.

2. Contemporary humans are not divisible into biological races. When anthropologists say races aren’t bio- logically real, they also reject the idea that modern humans can be divided into scientifically valid, biologically distinct groupings or races. For races to be real as biological categories, the classification must be based on ob- jective, consistent, and reliable bio- logical criteria. The classification sys- tem must also have predictive value that will make it useful in research.

Scientists have demonstrated that both the concept of race and racial criteria are subjective, arbitrary, and inconsistently applied.5 U.S. racial categories, such as the ones used in the Census, aren’t valid in part be- cause the biological attributes used to

define races and create racial classi- fications rely on only a few visible, su- p e rficial, genetic traits — such as skin color and hair texture — and ignore the remaining preponderance of hu- man variation. Alternative, equally vis- ible racial classifications could be con- s t ructed using such criteria as hair col- o r, e ye color, height, weight, ear shape, or hairiness. However, there are less visible genetic traits that have far gre a t- er biological significance. For exam- ple, there are at least 13 genetic factors related to hemoglobin, the protein that helps carry oxygen to tissues, and there is also significant variation in the ABO, RH, and other blood systems. We could create racial classifications based on genetic factors that affect susceptibil- ity to diabetes or to certain kinds of breast cancer or to the ability to di- gest milk. In sum, given the variety of possible biologically based traits for classifying human beings, the cri- teria used in U.S. racial categorizations are highly arbitrary and subjective. Our discussion here focuses on the U.S. concept of race. While racial con- cepts a re no doubt similar in Canada and Eu rope, this is not true in other parts of the Americas.6

The number of potential biolog- ically based racial groupings is enor- mous. Not only are there millions of

 

 

672 PHI DELTA KAPPAN

genetic traits, but most genetic traits — even culturally salient but super- ficial traits such as skin color, hair tex- t u re, eye shape, and eye color — do not cluster together. Darker skin can cluster with straight hair as well as with very curly hair or with hairy or nonhairy bodies; paler skin can clus- ter with straight or curly hair or with black or blond hair or with lighter to darker eyes. Each trait could pro- duce a different racial classification. For example, if one used height as a criterion rather than skin pigmenta- tion, then the No rthern Afghan pop- ulation would be in the same racial c a t e g o ry as the Swedes and the Tu t s i of Rwanda. There are huge numbers of genetically influenced traits, visi- ble and nonvisible, which could be used to classify humans into biolog- ically distinct groups. T h e re is no “n a t- u r a l” classification — no co-occurring clusters of racial traits. T h e re are just alternatives, with different implica- tions and uses.

Racial classifications are also un- scientific because they are unre l i a b l e and unstable over time. Individuals cannot reliably be “raced,” partly be-

cause the criteria are so subjective and unscientific. Robert Hahn, a medi- cal anthropologist, found that 37% of babies described as Native Ameri- can on their birth certificates ended up in a different racial category on their death certificates.7 Racial iden- tifications by forensic anthro p o l o g i s t s , long touted as accurate, have been shown to be disturbingly unreliable, e ven in re l a t i vely ethnically homo- geneous areas, such as Missouri and Ohio.8 Forensic evidence from such urban areas as San José, California, or New Yo rk City is even more pro b- l e m a t i c .

Racial categories used by the U.S. Census Bureau have changed over time. In 1900, races included “mu- latto, quadroon, or octoroon” in ad- dition to “black.” Southern Eu ro p e a n s and Jews we re deemed to be separate races before World War II. Asian In- dians (“Hindus”) were initially cate- g o r i zed as “Caucasoid” — e xcept for voting rights. The number and defi- nitions of races in the most recent U.S. Census reflect the instability — and hence unre l i a b i l i t y — of the con- cept of race. And U.S. racial classifi-

cations simply don’t work in much of the rest of the world. Brazil is a clas- sic, often-studied example, but they also don’t work in South Asia, an are a that includes over one-fifth of the world’s population.

Historical and contemporary Eu- ropean and American racial categories a re huge, biologically diverse macro – categories. Members of the same ra- cial group tend to be similar in a few genetic ways that are often biologi- cally irre l e vant. Mo re ove r, the genet- ic variability found within each ra- cial grouping is far greater than the genetic similarity. Africa, by itself, is home to distinct populations whose average height ranges from less than five feet (the Mbuti) to over six feet (the Tutsi). Estimates suggest that con- temporary racial variation accounts for less than 7% of all human genet- ic va r i a t i o n .9 U.S. races, then, are not biologically distinct or biologically m e a n i n gful, scientifically based gro u p- ings of the human species.

3. Race as biology has no scientific value. An additional critique of the concept of race is that racial cate- gories, as defined biologically, are not

 

 

MAY 2003 673

very useful in understanding other phenomena, whether biological or cul- t u r a l .

T h e re is no substantial evidence that race, as a biological category, and “r a- c i a l” characteristics, such as skin col- or, hair texture, and eye shape, are causally linked to behavior, to capac- ities, to individual and group accom- plishments, to cultural institutions, or to propensities to engage in any spe- cific activities. In the area of academ- ic achievement, the focus on race as biology can lead re s e a rchers to ignore underlying nonbiological causal fac- tors. One classic study found that con- t rolling for socioeconomic and other environmental variables eliminated p u r p o rted “r a c i a l” differences in I.Q. s c o res and academic achievement be- tween African American, Mexican American, and European American students.10

Health professionals have also cri- tiqued the concept of race. Alan Go o d- man and others have shown that race does not help physicians with diagno- sis, prevention, or treatment of med- ical diseases.11 Racial categories and a false ideology of race as “biology” encourage both doctors and their pa- tients to view medical conditions as necessarily genetic, ignoring possible e n v i ronmental sources. Hy p e rt e n s i o n , infant birt h weights, osteoporosis, ova r- ian c y s t s — all traditionally viewed as “r a c i a l” (i.e., genetically based) — n ow seem to reflect environmental rather than racially linked genetic factors. The Centers for Disease Control con- cluded in 1993 that most associations between race and disease have no ge- netic or biological basis and that the concept of “r a c e” is there f o re not use- ful in public health.

As a result of recent evolution and constant interbreeding between gro u p s of humans, two individuals from dif- f e rent “races” are just as likely to be m o re similar to one another genetic-

ally than two individuals from the same “race.” This being so, race-as- biology has no predictive value.

IF NOT RACE, THEN WHAT?

Classifications are usually created for some purpose. Alan Goodman and other biological anthro p o l o g i s t s suggest that investigators focus on using traits relevant to the problem at hand. For example, if a particular blood factor puts an individual at risk for a disease, then classify indi- viduals on that basis for that purpose.

Some suggest using the term “p o p- u l a t i o n” or “breeding population” to refer to the multitude of small, often geographically localized, groups that have developed high frequencies of one or more somewhat distinctive bi- ological traits (e.g., shovel-shaped in- cisors) in response to biological, his- torical, and cultural factors. But oth- ers point out that there could be thou- sands of such groups, depending on the classifying criteria used, and that the groups would be merging and re- combining over time and space. Mo re- ove r, the variability “c a p t u re d” would reflect only a fraction of the va r i a b i l- ity in the human species.

Most anthropologists now use the concept of “c l i n e s” to help understand how genetic traits are distributed.12

New data indicate that biological traits, such as blood type or skin color, are distributed in geographic gradations or “clines”; that is, the frequency of a trait varies continuously over a geo- graphic area. For example, the genes for type B blood increase in fre q u e n- cy in an east-to-west direction (re- flecting, in part, the travels of Gen- ghis Khan and his army). In contrast, skin pigmentation grades from nort h to south, with increasing pigmenta- tion as one gets closer to the equator. The frequency of the gene for sickle cell decreases from West Africa mov-

ing northeast. Vi rtually all traits have distinct geo-

graphic distributions. Genes contro l- ling skin color, body size and shape (head, limbs, lips, fingers, nose, ears), hairiness, and blood type are each dis- tributed in different patterns over ge- ographic space. Once again, for bio- logical races to exist, these traits would have to co-vary, but they don’t. In- stead, biological traits produce a near- ly infinite number of potential races. This is why anthropologists conclude that there are no scientifically distin- guishable biological races — only thou- sands of clines!

SO WHAT IS RACE THEN?

We hope we have made the point that the concept of separate, biolog- ically distinct human races is not sci- entifically defensible. Unfortunate- ly, racial ideology, by focusing on a few physical attributes, traps us in- to a discourse about race as biology rather than race as a cultural constru c- tion. The concept of race is a cultural i n vention, a culturally and historical- ly specific way of thinking about, cat- egorizing, and treating human beings.1 3

It is about social divisions within so- c i e t y, about social categories and iden- tities, about power and privilege. It has been and remains a particular type of ideology for legitimizing social in- equality between groups with differ- ent ancestries, national origins, and histories. Indeed, the concept of race is also a major system of social iden- tity, affecting one’s own self-percep- tion and how one is perc e i ved and tre a t- ed by others.

But race does have a biological com- ponent, one that can trick us into think- ing that races are scientifically valid, biological subdivisions of the human species. As noted earlier, geographic- ally localized populations — as a re s u l t of adaptation, migration, and chance

 

 

674 PHI DELTA KAPPAN

— tend to have some characteristic physical traits. While these may be traits that characterize an entire pop- ulation, such as hairy ears, it is more accurate to talk about the re l a t i ve fre- quency of a particular trait, such as blood type O, in one population as compared to another, or the relative amount of pigmentation of individu- als in a population, relative to other populations. Some traits, such as skin color, reflect climatic conditions; oth- ers, such as eye color and shape, probably reflect ran- dom, historical processes and migration patterns. T h e U.S. was peopled by pop- ulations from geographic- ally distinct regions of the w o r l d — vo l u n t a ry immi- grants, forced African slave s , and indigenous American groups. Therefore, domi- nant northwestern Euro- pean ethnic groups, such as the English and Germans, were able to exploit certain visually salient biological traits, especially skin color, as markers of race.

The effectiveness of these physi- cal traits as markers of one’s race de- pended, of course, on their being pre- s e rved in future generations. So dom- inant cultural groups created elabo- rate social and physical barriers to mating, reproduction, and marriage that crossed racial lines. The most ex- plicit were the so-called anti-misce- genation laws, which outlawed sex between members of different races, whether married or not. These laws were not declared unconstitutional by the U.S. Supreme Court until the 1967 case of L ov i n g v. Vi r g i n i a.1 4 A n- other vehicle was the cultural defini- tion of kinship, whereby children of interracial (often forced) matings ac- q u i red the racial status of their lowe r – ranking parent; this was the so-called

o n e – d rop rule or hypodescent. Espe- cially during the time of slavery, the lower-ranking parent was generally the mother, and thus the long-stand- ing Eu ropean cultural tradition of af- filiating socially “legitimate” childre n with the father’s kinship group was effectively reversed.

In contrast, there have been few- er social or legal barriers in the U.S.

to mating and marriage between It a l- ians, British, Germans, Swedes, and others of European ancestry. Con – sequently, the physical and cultural characteristics of European region- al populations are less evident in the U.S. With intermarriage, distinct Eu- ropean identities were submerged in the culturally re l e vant macroracial cat- e g o ry of “w h i t e” — m o re accurately, European American.

Thus even the biological dimen- sion of contemporary racial gro u p i n g s is the result of sociocultural process- es. That is, humans as cultural beings first gave social significance to some physical differences between groups and then tried to perpetuate these “r a- cial mark e r s” by pre venting social and physical intercourse between mem- bers of the groups. Although the dom- inant racial ideology was about main- taining racial “purity,” the issue was

not about biology; it was about main- taining social, political, and econom- ic privilege.15

WHY IS THIS UNDERSTA N D I N G I M P O RTANT FOR EDUCATO R S ?

We hope we’ve convinced you that race isn’t biologically “real” and that race in the U.S. and elsewhere

is a historical, social, and cultural creation. But so what? What is the signifi – cance of this way of view- ing race for teachers, stu- dents, and society?

1 . The potential for change. First, it is important to un- derstand that, while races a re biological fictions, they a re social realities. Race may not be “re a l” in a biological sense, but it surely is “re a l” s o c i a l l y, politically, econom- i c a l l y, and psyc h o l o g i c a l l y. Race and racism pro f o u n d- ly s t ru c t u re who we are, how

we are treated, how we treat others, and our access to re s o u rces and rights.

Perhaps the most important mes- sage educators can take from the fore- going discussion is that race, racial classifications, racial stratification, and other forms of racism, including ra- cial ideology, rather than being part of our biology, are part of our cul- ture. Like other cultural forms, both the concept of race and our racial clas- sifications a re part of a system we have created. This means that we have the ability to change the system, to trans- form it, and even to totally eradicate it. Educators, in their role as trans- mitters of official culture, are partic- ularly well poised to be active change agents in such a transformation.

But how, you may well ask, can teachers or anybody else make peo- ple stop classifying by race? And are t h e re any good reasons to do so? T h e s e

Race, racial c l a s s i f i c a t i o n s, racial stratification, and other

forms of racism, including racial ideology, rather than

being part of our biology, are part of our culture.

 

 

MAY 2003 675

familiar categories — black, white, Asian, Native American, and so on — seem so embedded in U.S. socie- t y. They seem so “natural.” Of course, t h a t’s how culture works. It seems “n a t- u r a l” to think of chicken, but not rats, as food. But, as we have shown above , the labels and underlying constructs that we use to talk about human di- versity are unstable, depending on par- ticular social, political, and historical contexts. Individuals in positions of a u t h o r i t y, of course, have the ability to change them institutionally. But o rd i n a ry people also have the ability to change how they classify and label people in their everyday lives.

Se veral questions arise at this point. Do we as educators consciously want to change our way of conceptualiz- ing and discussing human biological variation? What makes the “race as biology” assumption so dangerous? A re we going to continue to classify people by race, even while recogniz- ing that it is a social construct? What vested interests do people have in hold- ing o n t o — or re j e c t i n g — racial cat- egories? How can we become more sophisticated in our understanding of how systems of classification work while also becoming more critical of our own ways of classifying people? Are there alternative ways of think- ing about, classifying, and labeling human beings that might be more em- powering for students, teachers, and community members? By eliminat- ing or changing labels, will we change the power stru c t u res that perpetuate privilege and entitlement? Moving be- yond race as biology forces us to con- front these and other issues.

2. The dangers of using racial clas- sifications. Categories and classifica- tions are not intrinsically good or bad. People have always grouped others in ways that were important within a given society. However, the myth of race as biology is dangerous because

it conflates physical attributes, such as skin color, with unrelated qualities, such as intelligence. Racial labels de- lude people into thinking that race p redicts such other outcomes and be- haviors as achievement in sports, mu- sic, or school; rates of employment; p regnancies outside marriage; or dru g use. Race was historically equated with intelligence and, on that basis, was used to justify slave ry and education- al discrimination; it later provided the rationale that supported the genocide of Jews, blacks, Gypsies, and other “ i n f e r i o r” races under Hi t l e r. So using racial categories brings along this his- t o ry, like unwanted baggage.

Ma c roracial categories are danger- ous in that the categories ove r s i m p l i- fy and mask complex human differ- ences. Saying that someone is Asian tells us virtually nothing concrete, but it brings with it a host of stere o t y p e s , such as “model minority,” “quiet,” “good at math,” “inscrutable,” and so on. Yet the Asian label includes a wide range of groups, such as Kore- ans, Filipinos, and Vietnamese, with distinct histories and languages. The same is true for “white,” a term that h o m o g e n i zes the multiple nationali- ties, languages, and cultures that con- stitute Europe. The label “African A m e r i c a n” ignores the enormous lin- guistic, physical, and cultural diver- sity of the peoples of Africa. The term “black” conflates people of African descent who we re brought to the U.S. as slaves with recent immigrants fro m Africa and the Caribbean. These mac- roracial labels oversimplify and re d u c e human diversity to four or five giant g roups. Ap a rt from being bad science, these categories don’t predict anything helpful — yet they have acquired a life of their own.

Macroracial categories, such as those used in the U.S. Census and other institutional data-collection ef- f o rts, force people to use labels that

may not re p resent their own self-iden- tity or classifying system. They must either select an existing category or select “o t h e r” — by definition, a kind of nonidentity. The impossibility, un- til re c e n t l y, of selecting more than one ethnic/racial category implicitly stig- m a t i zes multiracial individuals. And the term “m i xe d” wrongly implies that t h e re are such things as “p u re” races, an ideology with no basis in science. The recent expansion of the number of U.S. Census categories still cannot accommodate the diversity of the U.S. population, which includes people whose ancestry ranges from Egypt, Brazil, Sri Lanka, Ghana, and the Do- minican Republic to Iceland and Ko- re a .

3 . How macro racial categories have s e rved people in positive ways. Ha v i n g noted some negative aspects, it is equal- ly important to discuss how macro- racial categories also serve society. Re- call that labels are not intrinsically “good” or “bad.” It depends on what people do with them. During the 1960s, the U.S. civil rights move m e n t helped bring about consciousness and pride in being African American. T h i s consciousness — known by terms such as ethnic pride and black power — united people who had been the vic- tims of racism and oppression. Fro m that consciousness sprang such edu- cational interventions as black and Chicano history classes, ethnic stud- ies departments, Afrocentric schools, and other efforts to empower yo u n g people. The movement to engender pride in and knowledge of one’s ances- t ry has had a powe rful impact. Ma n y individuals are deeply attached to these racial labels as part of a positive iden- t i t y. As one community activist put it, “Why should I give up being a race? I like being a race.”

Racial classification can also have positive impact by allowing educa- tors to monitor how equitably our

 

 

676 PHI DELTA KAPPAN

institutions are serving the public. Racial categories are used by schools to disaggregate data on student out- comes, including achievement, atten- dance, discipline, course placements, college attendance rates, and other a reas of school and student perf o r m- ance. These data are then used to ex- amine whether certain groups of stu- dents are disproportionately repre- sented in any outcome areas. For ex- ample, a school might discover that the percentage of Latino students who receive some type of disciplinary in- t e rvention is higher than that for oth- er school populations. The school can then consider what it can do to change this outcome. Teachers might ask, Is t h e re something about the way Lati- no students are treated in the school that leads to higher disciplinary re f e r- ral rates? What other factors might be involved?

The racial classifications that ed- ucators use to monitor student out- come data reflect our society’s social c o n s t ruction of race. As such, the cat- egories re p resent groups that have been historically disenfranchised, oppre s s e d , or marginalized. Without data disag- gregated by race, gender, and other categories, it would be difficult to iden- tify problems stemming from race- based institutional and societal fac- tors that privilege certain groups, such as the widespread U.S. practice of track- ing by so-called ability. Without data broken out according to racial, gen- der, and ethnic categories, schools would not be able to assess the posi- t i ve impact intervention programs have had on different groups of students.

4 . Shifting the conversation from bi- o l o gy to culture. One function of the myth of race as biology has been to distract us from the underlying caus- es of social inequality in the United States. Dismantling the myth of race as biology means that we must now shift our focus to analyzing the social,

economic, political, and historical con- ditions that breed and serve to per- petuate social inequality. For educa- tors, this means helping students to recognize and understand socioeco- nomic stratification, who benefits and who is harmed by racial discrimina- tion, and how we as individuals and institutional agents can act to dis- mantle ideologies, institutions, and practices that harm young people.

There is another, more profound implication of the impermanence of race. Cu l t u re, acting collective l y, and humans, acting individually, can make races disappear. That is, we can mate and marry across populations, thus destroying the racial “markers” that have been used to facilitate categori- zation and differential treatment of people of different ancestry and so- cial rank. An understanding of hu- man biological variation reveals the positive, indeed essential, role that intermating and intermarriage have played in human evolution and hu- man adaptation. Rather than “mon- g re l i z i n g” a “p u re species,” mating be- t ween d i f f e rent populations enriches the genetic pool. It is society, rather than nature — and socially and eco- nomically stratified societies, for the most part — that restricts social and sexual intercourse and seve rely penal- i zes those who mate across racial and other socially created lines.

SUGGESTIONS A N D RESOURCES FOR EDUCATO R S

A n t h ropological knowledge about race informs us about what race is and is not, but it cannot guide edu- cational decision making. The under- lying goal of social justice can help educators in making policy decisions, such as whether to use racial and eth- nic categories to monitor education- al outcomes. As long as we contin- ue to see racially based disparities in

young peoples’ school achievement, then we must monitor and investi- gate the social conditions that pro- duce these disparities. We must be care- ful, however, to avoid “biologizing” the classification; that is, we must avo i d assuming genetic explanations for ra- cial d i f f e rences in behaviors and edu- cational outcomes or even diseases.

As we pursue a more socially just world, educators should also contin- ue to support young people’s quest for knowledge about the history and s t ruggles of their own people, as we l l as those of other groups, so that stu- dents in the future will not be able to point to their textbooks and say, “My people are not included in the curriculum.” In the process, we can encourage both curiosity about and respect for human diversity, and we can emphasize the importance that historical and social context plays in creating social inequality. We can al- so encourage comparative studies of racial and other forms of social strat- ification, further challenging the no- tion that there is a biological expla- nation for oppression and inequality. In short, students will understand that there is no biological explanation for a gro u p’s historical position as either oppressed — or oppressor. We can encourage these studies to point out variations and fine distinctions with- in human racial groupings.

In addition to viewing the tre a t m e n t of race and racial categories through a social-justice lens, we would apply another criterion that we call “d e p t h of knowledge.” We believe that it is important to challenge and inspire young people by exposing them to the best of our current knowledge in the sciences, social sciences, and oth- er disciplines. Until now, most stu- dents in our education system have not been exposed to systematic, sci- entifically based teaching about race and human biological variation. On e

 

 

MAY 2003 677

reason is that many social studies teach- ers may think they lack sufficient back- g round in genetics and human biol- o g y. At the same time, many biology teachers may feel uncomfortable teach- ing about race as a social construct. The null move for teachers seems to be to say that we should all be “c o l o r blind.” However, this does not help educate students about human dive r- s i t y, both biological and social. In rare cases when students have the oppor- tunity to engage in studies of race, ethnicity, culture, and ways to end racism, they are both interested and intellectually challenged.1 6 One high school teacher who teaches students about race said he wants to dispel the notion that teaching about dive r s i t y is “touchy feely.” “We don’t just want to touch diversity; we want to ap- proach it academically. . . . We feel we have a definite discipline.”17

Rather than shield students and our- s e l ves from current scientific knowl- edge about race, including its contra- dictions and controversies, we sub- mit that educators should be pro- viding opportunities for students to learn what anthropologists, geneti- cists, and other scientists, inc l u d i n g social scientists, have to say about hu- man biological variation and the is- sue of race. Particularly in midd l e schools, high schools, and beyond, students should be involved in in- q u i ry projects and social action projects, in critical examination of the labels we currently use, and in

analysis of the reasons for and against using them in particular c o n t e x t s . Rather than tell students that they should or should not use racial lab e l s ( e xcept for slurs), educators should be c reating pro jects in which students explore together the range of possi- ble ways of classifying people and the i mplications and political signifi- cance of alternative approaches in different contexts.

We would like to conclude by of- fering readers some ideas for student inquiry and by suggesting some re- sources that can serve to get teach- ers in all subject areas started on the quest to learn about human biolog- ical variation and ways to teach about it.

1. Ideas for student inquiry. Here are some examples of how teachers might engage students in critically examining the social, historical, and cultural construction of racial cate- gories.

‱ Have students create and em- p l oy alternative “r a c i a l” classification schemes using as many observable and nonobservable physical differe n c- es as they can think of (e.g., foot size , height, ear shape, eye b row shape, waist/ shoulder ratio, hairiness). What do the groups look like? What does this tell us about macroracial classifica- tions based on skin pigmentation and other surface features?

‱ Sh ow students U.S. Census forms from 1870, 1950, and 2000, and ask them to place themselves in the most

a p p ropriate category. Or show a photo- graph of a person of multiple ethnic a n c e s t ry and ask students to place this person in one of the categories from these three censuses. Ask them why they think the census form has changed over time and what that says about the meaning of “race.”

‱ Ask immigrant students to in- vestigate the racial/ethnic categories used in their country of origin and to reflect on how well they mesh with the U.S. categories. For example, have students from Mexico taken on an identity as Latino or Hispanic? And what does it mean for them to be- come part of a larger “macro” race in the U.S.?18

‱ Ask students how they feel when someone asks them to “represent their race.” For example, how do stu- dents who identify themselves as Af- rican Americans feel when s o m e o n e asks, “How do African Americans feel about this issue?” or “What’s the African American perspective on this?”

‱ Discuss “re verse disc r i m- ination.” When did this term come in- to use and why? Who is being dis- criminated against when discrimina- tion is reversed?

‱ Discuss “political correctness.” Where did this term come from? Who uses it and for what purposes? And why did it emerge?

2. Resources for teachers. The fol- l owing examples will give readers a place to start in compiling resources

 

 

678 PHI DELTA KAPPAN

available for teaching about race. ‱ Two major anthropological as-

sociations have produced highly re a d- able position statements on the topic of race and human biological varia- tion. First, the American Anthropo- logical Association website features both the AAA position and a sum- m a ry of testimony given in conjunc- tion with the debates on the 2000 census categories. Second, the offi- cial statement of the American Asso- ciation of Physical Anthropologists has appeared in that organization’s journal.19

‱ The American Anthropological Association is making a special ef- fort to disseminate understandings about race and human variation to the broader public. AnthroNotes, de- signed for precollege teachers, is a superb resource that offers concrete approaches to teaching about race, human diversity, and human evolu- tion. It is available at no charge from the Anthropology Outreach Office ( a n t h ro u t [email protected]). Se v- eral past issues of AnthroNotes treat race and ethnicity.2 0 A n t h ro p o l o g i s t s have produced materials for precol- lege teachers and teacher educators that deal with cultural diversity; some include strategies for teaching about culture and human diversity.21 Oth- ers provide useful overviews of rele- vant topics.22

‱ The AAA is currently engaged in a public education initiative called Understanding Race and Human Va r i- ation, which will involve a traveling museum exhibit and a website. The Fo rd Foundation has contributed one million dollars to this project.

‱ In 1999, the AAA created a spe- cial commission called the Anthro- pology Education Commission (AEC) to “help achieve significant progress t ow a rds the integration of anthro p o- logical concepts, methods, and issues into pre-K through community col-

lege and adult education as a means of increasing public understanding of anthropology.” The two teaching modules by Leonard Lieberman and by Lieberman and Patricia Rice, which we cited above, are available at no charge on the AEC website (www. a a a n e t . o r g / c o m m i t t e e s / c o m m i s s i o n s / aec). The AEC webpage contains ex- t e n s i ve re s o u rces that teachers can use to teach anthropological concepts and methods, including some that addre s s race.

Anthropologists recognize an ob- ligation to disseminate their knowl- edge of human biological variation and the social construction of race to the wider public. We hope that this a rticle and the re s o u rces we have pro- vided will contribute to this effort.

1. Richard Herrnstein and Charles Murray, The Bell Cu rve: Intelligence and Class St ru c t u re in Am e r- ican Life (New York: Free Press, 1994). 2. Audrey Smedley, Race in North America: Ori- gin and Evolution of a Wo rl d v i e w ( B o u l d e r, Colo. : Westview Press, 1998). 3. Jonathan Marks, Human Biodiversity: Genes, Race, and History (New York: Aldine de Gruyter, 1995). 4. Leonard Lieberman and Patricia Rice, “Races or Clines?,” p. 7, available on the Anthropolo- gy Education Commission page of the Ameri- can Anthropological Association website, www. aaanet.org/committees/commissions/aec — click on Teaching About Race. 5. George J. Armelagos and Alan H. Goodman, “Race, Racism, and Anthropology,” in Alan H. Goodman and Thomas L. Leatherman, eds., Building a New Biocultural Synthesis: Political- Economic Perspectives on Human Biology (Ann Arbor: University of Michigan Press, 1998). 6 . Je f f rey M. Fish, “Mi xed Blood,” in James Sp r a d- ley and William McCurdy, eds., Conformity and Conflict, 11th ed. (New York: Allyn & Bacon, 2002), pp. 270-80. 7. Alan Goodman, “Bred in the Bone?,” Sci- ences, vol. 37, no. 2, 1997, p. 24. 8. Ibid., p. 22. 9. Leonard Lieberman, “ ‘Race’ 1997 and 2001: A Race Odyssey,” available on the Anthropolo- gy Education Commission page of the Ameri- can Anthropological Association website, www. aaanet.org/committees/commissions/aec — click on Teaching About Race.

1 0 . Jane Me rc e r, “Ethnic Di f f e rences in IQ Scores: What Do They Mean? (A Response to Lloyd Dunn),” Hispanic Journal of Behavioral Sciences, vol. 10, 1988, pp. 199-218. 11. Goodman, op. cit. 12. Lieberman and Rice, op. cit. 13. Carol Mukhopadhyay and Yolanda Moses, “Reestablishing ‘Race’ in Anthropological Dis- course,” American Anthropologist,vol. 99, 1997, pp. 517-33. 14. Janet Hyde and John DeLamater, Under- standing Human Sexuality, 6th ed. (New York: McGraw-Hill, 1997). 15. Smedley, op. cit. 16. Karen Donaldson, Through Students’ Eyes: Combating Racism in United States Schools (We s t- p o rt, Conn.: Praeger, 1996); and Rosemary C. Henze, “Curricular Approaches to Developing Positive Interethnic Relations,” Journal of Negro Education, vol. 68, 2001, pp. 529-49. 17. Henze, p. 539. 18. Clara Rodriguez, Changing Race: Latinos, the Census, and the History of Ethnicity in the United States (New York: New York University Press, 2000); and Gilberto Arriaza, “The School Yard as a Stage: Missing Culture Clues in Sym- bolic Fighting,” Multicultural Education Jour- nal, Spring 2003, in press. 1 9 . American Anthropological Association, “A A A Statement on Race,” www. a a a n e t . o r g / s t m t s / r a c e p p. htm; and American Association of Physical An- thropologists, “AAPA Statement on Biological Aspects of Race,” American Journal of Physical Anthropology, vol. 101, 1996, pp. 569-70. 20. Alison S. Brooks et al., “Race and Ethnici – ty in America,” in Ruth O. Selig and Marilyn R. London, eds., An t h ro p o l o gy Ex p l o red: The Be s t of Smithsonian An t h ro No t e s (Washington, D.C.: Smithsonian Institution Press), pp. 315-26; E. L. Cerrini-Long, “Ethnicity in the U.S.A.: An An- thropological Model,” AnthroNotes, vol. 15, no. 3, 1993; William L. Merrill, “Identity Tr a n s f o r- mation in Colonial Northern Mexico,” Anthro- Notes, vol. 19, no. 2, 1997, pp. 1-8; and Boyce Re n s b e r g e r, “Forget the Old Labels: He re’s a New Way to Look at Race,” AnthroNotes, vol. 18, no. 1, 1996, pp. 1-7. 21. Hilda Hernandez and Carol C. Mukhopa – dhyay, Integrating Multicultural Perspectives in Teacher Education: A Curriculum Resource Guide (Chico: California State University, 1985); and Conrad P. Kottak, R. Furlow White, and Patri- cia Rice, eds. The Teaching of Anthropology: Prob- lems, Issues, and De c i s i o n s ( Mountain Vi ew, Calif. : Mayfield Publishing, 1996). 22. Faye Harrison, “The Persistent Power of ‘Race’ in the Cultural and Political Economy of Racism,” Annual Review of Anthropology, vol. 24, 1995, pp. 47-74; and Ida Susser and T h o m a s Patterson, eds., Cultural Diversity in the United States: A Critical Reader (Malden, Mass.: Black- well, 2001). K

 
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Marine Biology 180

How to Effectively Write a Fact-supported Essay

1. University standard. Write a 10-15 sentence, fact-supported, essay answer to your assigned weekly question(s).

2. How to determine your assigned weekly essay question(s)? You will be answering the “Study Guide Questions” (found under Course Content), for the assigned weekly textbook chapters listed in your Class and Assignment Schedule. These are excellent questions representing the most important concepts in our course. Therefore, if you cut-and-paste your classmates’ correct answers to these weekly questions, you will have created an excellent Study Guide (questions plus answers) for studying for your final exam. To determine your assigned question(s), go to the Navigation Bar, Roster, select the Students tab, alphabetize by student’s last name, then count down the list of students to your name. That number is your student number. You only need to check this number once each week, as students will drop the class, causing your number to change. Now, go to the last paragraph in this document and use your class Week number and your student number to determine your assigned essay question(s) to answer. Don’t be concerned that more than one student does the same question(s), as student numbers will change when students drop the course.

3. Mechanics a. Your discussion directions will direct you to submit your work by selecting Start a New Thread. Do not use attachments. b. After the week is over, the discussion is closed to further input so that we can move forward to the next week’s discussions. I will not respond to every discussion that is made, but will be following your submissions and responses, and interjecting when I feel it is appropriate. c. I will interact weekly with each student using a completed discussion grading rubric, so be sure to read them for my feedback. The last paragraph explains where to find them in LEO.

4. Expectations a. Your submission must be thorough, concise, positive, and in essay form using effective writing, with a length of one or two single-spaced paragraphs totaling 10-15 sentences (not including the question(s) or references). Question(s) should be in bold font. Answers should discuss the concept in DETAIL to show your understanding of the topic. If you need more scholarly information on your topic, consider an internet search or a second textbook. b. Your submission must be paraphrased (as explained in UMUC’s “How to Avoid Plagiarism” self-study module), i.e. written in your own words. Do not copy or cut-and-paste from any source. Do not use direct quotes. The reason I insist on this is because (1) student comprehension is significantly increased by paraphrasing instead of copying verbatim material, and (2) UMUC considers copying-and-pasting another author’s work to be plagiarism. Paraphrasing also allows me to identify, and subsequently correct, any misconceptions a student may have with the course material. I will not give credit to an input that gives little detail, or uses verbatim text from an internet site, our course materials, or other source. c. Use APA in-text and reference list citations, which are explained on UMUC’s APA Citation Examples web page, as well as in UMUC’s “How to Avoid Plagiarism” self-study module. Liberally use in-text citations to cite material which is not your own. Use our course materials as your primary reference. You may use other scholarly, peer-reviewed references in addition to our course materials. 1) If using an electronic textbook, use the provided physical textbook page numbers for your citations. 2) If you wish to add an internet reference, be sure to use a paragraph number in its in-text citation if the reference has no page number. The internet address should also be a “hot link” which allows the reader to click on it and be taken directly to the page where you found the information. 3) Use only scholarly references, dated no older than 10 years. Do not use dictionary references. Do not cite commercial web sites (URL ending in “.com”) since they are not scholarly (i.e. peer-reviewed). d. I will evaluate effective writing based on the Maryland Statewide English Composition standard for undergraduate writing which states that writing should be “substantially free of errors in grammar, spelling, punctuation, and mechanics” to earn a “C” grade. e. I will grade your first submission of that week; therefore, submit only final, not draft, versions of your work. For effective writing assistance, you may wish to have UMUC’s Effective Writing Center review your work before submission. f. No late submissions are accepted. Before the deadline, use the “Edit” function to correct errors that I bring to your attention.

5. Discussion example with errors. To read error comments, you will need to use Microsoft Word and select View => Print Layout. Paragraph 5 provides a corrected version.

Discussion subject line: Jones Comment by Dennis Whitford: Missing question number

2. Differentiate between marine biology, biological oceanography, and oceanography. Comment by Dennis Whitford: Did not bold question number and question

Marine biology is closely related to both oceanography and biological oceanography, a subset of oceanography. (Castro & Huber, 2013, p. 2) If you were studying marine organisms, and how they interact with their environment and other marine organisms, you would be studying marine biology (Begin et al., 2014, p. 2). However, if you were studying the ocean from the perspective of one, or many, natural sciences, such as biology, geology, etc., you would be studying oceanography (Begin, Wurzbacher, & Cucknell, 2014, p. 2). Comment by Dennis Whitford: End-of-sentence punctuation comes after the in-text citation Comment by Denny Whitford: Format: first use in a paragraph of a multi-author reference must use all author’s names. Comment by Denny Whitford: 2nd and subsequent use in a paragraph of multi-author ref can use all authors or use the shortened “et al.” version.

Castro & Huber (2013) explain that marine biology is the study of biology applied to the sea, and that scientific study of the ocean is oceanography (p.2). Oceanography, being a broad area of study, are split into many branches, including biological oceanography (Castro & Huber, 2013, p. 2). Often, marine biology and biological oceanography are hard to set apart from each other. However, there are a few dissimilarities that can be pointed out. Castro & Huber (2013) explain that marine biologists focus their examination to marine organisms which live closer to the shoreline (and sometimes on terrestrial organisms), while biological oceanographers spend their attention on organisms in the deep, open ocean (p. 2). Meteorologists study the weather and climate. Marine biologists focus their attention on the roles and life cycles of the organsm, while biological oceanographers focus their attention on the effects of the organism on the ocean as a whole (Castro & Huber, p. 2). More specifically, marine biologists show interest in the reproduction, physiology, or biochemistry specific to the marine organism which they are studying (Marine Biology & Biological Oceanography, 2010, para. 1). On the other hand, biological oceanographers focus on the ecological effects of the organisms they study; especially taking into account the different physical characteristics of the ocean environment they live in (Marine Biology & Biological Oceanography, 2010). However, these distinctions are not very easy to draw, and there are many exceptions, meaning that some scientists consider these two branches to be the same (Castro & Huber, 2013, p. 2). Comment by Dennis Whitford: Missing blank space Comment by Dennis Whitford: Ineffective writing (grammar) Comment by Dennis Whitford: Irrelevant statement Comment by Dennis Whitford: Ineffective writing (spelling) Comment by Dennis Whitford: Missing year

References:

BĂ©gin, C., Wurzbacher, J., & Cucknell, M. (2014). BIOL 181: Life in the oceans – Lecture notes. Posted in University of Maryland University College (UMUC) BIOL 181 online classroom, archived at UMUC, Adelphi MD.

Castro, P., & Huber, M. E. (2013). Marine Biology (9th ed.). New York: McGraw-Hill Higher Education Comment by Dennis Whitford: Incorrect capitalization and missing italics Comment by Dennis Whitford: Missing ending period

(2010). Marine Biology & Biological Oceanography. Retrieved June 5, 2010, from http://www.lifesci.ucsb.edu/eemb/programs/graduate/research/marine_biology/marine_biology.html . Comment by Dennis Whitford: Incorrect reference list citation format for an Internet citation Comment by Dennis Whitford: Missing hyperlink

Errors Not shown:

Essay did not answer question that was asked

Verbatim copying of any material from textbook or another source

Failure to use any in-text citations Use of quotations rather than mandatory paraphrasing

 

5. Same discussion example, with all errors corrected. This submission scores 100%.

Discussion subject line: Jones, Question #2

2. Differentiate between marine biology, biological oceanography, and oceanography.

Marine biology is closely related to both oceanography and biological oceanography, a subset of oceanography (Castro & Huber, 2013, p. 2). If you were studying marine organisms, and how they interact with their environment and other marine organisms, you would be studying marine biology (Begin, Wurzbacher, & Cucknell, 2014, p. 2). However, if you were studying the ocean from the perspective of one, or many, natural sciences, such as biology, geology, etc., you would be studying oceanography (Begin et al., 2014, p. 2).

Castro & Huber (2013) explain that marine biology is the study of biology applied to the sea, and that scientific study of the ocean is oceanography (p. 2). Oceanography, being a broad area of study, is split into many branches, including biological oceanography (Castro & Huber, 2013, p. 2). Often, marine biology and biological oceanography are hard to set apart from each other. However, there are a few dissimilarities that can be pointed out. Castro & Huber (2013) explain that marine biologists focus their examination to marine organisms which live closer to the shoreline (and sometimes on terrestrial organisms), while biological oceanographers spend their attention on organisms in the deep, open ocean (p. 2). Marine biologists focus their attention on the roles and life cycles of the organism, while biological oceanographers focus their attention on the effects of the organism on the ocean as a whole (Castro & Huber, 2013, p. 2). More specifically, marine biologists show interest in the reproduction, physiology, or biochemistry specific to the marine organism which they are studying (UCSB, 2010, para. 1). On the other hand, biological oceanographers focus on the ecological effects of the organisms they study; especially taking into account the different physical characteristics of the ocean environment they live in (UCSB, 2010, para. 1). However, these distinctions are not very easy to draw, and there are many exceptions, meaning that some scientists consider these two branches to be the same (Castro & Huber, 2013, p. 2).

References:

BĂ©gin, C., Wurzbacher, J., & Cucknell, M. (2014). BIOL 181: Life in the oceans – Lecture notes. Posted in University of Maryland University College (UMUC) BIOL 181 online classroom, archived at UMUC, Adelphi MD.

Castro, P., & Huber, M. E. (2013). Marine biology (9th ed.). New York: McGraw-Hill Higher Education.

UCSB (2010). Marine biology & biological oceanography. Retrieved June 5, 2010, from http://www.lifesci.ucsb.edu/eemb/programs/graduate/research/marine_biology/marine_biology.html

6. If you are assigned more than one question, divide your submission into smaller parts:

Question A

Answer A

Question B

Answer B

Question C

Answer C

Note the 10-15 sentence requirement applies to your entire submission, and not to each of the multiple questions.

 

7. Your discussion grading rubric template is provided in LEO with the discussion directions. After the discussion due date, you can read the completed (1) rubric feedback and score and (2) grade feedback by going to: My Tools, User Progress.

 

8. Now, go to the tables below and use your student number and class Week number to determine your assigned essay question(s) to answer. Don’t be concerned that more than one student does the same question, as student numbers may change in the middle of a week.

 

 

.

 

 

 

2

 

BIOL 181 Week 1BIOL 181 Week 3

Student

chques

Student

chques

Student

chques

Student

chques

Student

chques

Student

chques

#

##

#

##

#

##

#

##

#

##

#

##

1111225231116112732384

2121326241226213742485

3131427251336314752586

4141528261446415762687

5151629271556516772788

61617210281666617782861

71718211291776718792962

821192123021868197103063

92220213312296920813164

1023212143223107121823265

1124222153324117222833366

BIOL 181 Week 4BIOL 181 Week 5

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"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

Which of these would be a valid hypothesis?

MULTIPLECHOICE SECTION INSTRUCTIONS: Read all instructions carefully. Please answer all questions. Each question is worth 0.5 points. The Multiple Choice section is worth 40 points.

 

**Do not enter your answers here.** Type in the letter you select as the best answer on the Answer Sheet provided by your instructor.

 

1. Which of these would be a valid hypothesis?

A) Human history is determined by a series of supernatural events.

B) Humans should help in the conservation of other animal species.

C) Humans are controlled by forces beyond our understanding.

D) Humans and bacteria share a common genetic code.

 

2. In the scientific method, a hypothesis .

A) is a statement of fact

B) can only be tested once

C) is usually proven to be correct

D) is a proposed explanation based on observations

E) none of the above

 

3. What is the correct sequence of steps in the scientific method?

I. State the problem

II. Analyze and interpret the data

III. Share the results with other scientists

IV. Develop a hypothesis

V. Design and perform an experiment to test the hypothesis

 

A) I → II → III → IV → V

B) III → I → V → II → IV

C) V →IV → III → II → I

D) I → IV → V → II → III

E) V → II → I → III → IV

 

 

 

 

 

 

4. To test a hypothesis about a given variable, experimental and control groups are tested in parallel. Which of the following best explains the dual experiments?

A) In the experimental group, a chosen variable is altered in a known way. In the control group, that chosen variable is not altered so a comparison can be made.

B) In the control group, a chosen variable is altered in a known way. In the experimental group, that chosen variable is not altered so a comparison can be made.

C) In the experimental group, a chosen variable plus all other variables are altered.

In the control group, the chosen variable is altered; however, all other variables are held constant.

D) In the experimental and control groups, two different variables are altered.

E) Experimental and control group experiments are identical and run in parallel to get repeatable results.

 

5. Which of the following can be considered definitions of “theory”?

A) A theory can be an explanation of scientific laws

B) A theory is a widely accepted integrated explanation of numerous hypotheses, each supported by a large body of observations and experiments

C) A theory is a condensation and simplification of many data that previously appeared unrelated

D) A theory is a prediction for new data suggesting new relationships among a range of natural phenomena

E) All of the above

 

6. You have formulated a hypothesis that light is not necessary for seed germination.

 

To test your hypothesis, one set of maple seeds is placed in light with warm temperatures and adequate moisture. Another set of identical seeds is placed in the dark under the same set of conditions. The control in the experiment is

 

A) seeds in the dark

B) seeds in the light

C) warm temperature

D) adequate moisture

E) germination rate

 

7. A newly discovered multicellular organism obtains food by digesting dead organisms. Such an organism is most likely a member of the kingdom .

A) Plantae

B) Fungi

C) Protista

D) Animalia

 

 

8. Which of the following structures can perform all the activities required for life?

A) organelles

B) nuclei

C) DNA molecules

D) cells

E) plasma membrane

 

9. A group of medical researchers recently tested the effects of a cholesterol- lowering medication, Drug A, on women who had high blood levels of cholesterol. The researchers did the following experiment and obtained the indicated results. One group of 150 women took a tablet containing 40 mg of Drug A for 90 days; 120 of this group decreased their blood levels of cholesterol by at least 10%. Another group of 150 women was given a tablet with no added Drug A for 90 days; 25 of these women decreased their blood levels of cholesterol by at least 10%.

Which of the following is the most reasonable and accurate conclusion based on results obtained in this experiment?

 

A) Drug A is good for women.

B) Drug A is found in the blood of women.

C) Women taking tablets supplemented with Drug A will show a decrease in cholesterol levels in the blood.

D) Women taking tablets supplemented with Drug A will show an increase in cholesterol levels in the blood.

E) Blood levels of cholesterol are not affected by oral supplementation of Drug A.

 

 

 

10. Using the branching tree of life for bears depicted in the accompanying figure, choose from among the following bear species the one that is most closely related to the polar

bear.

 

 

 

 

A) brown bear

B) sun bear

C) spectacled bear

D) giant panda

 

 

 

 

 

 

 

 

Page 4 of 25 © UMUC

 

 

 

 

 

11. What are the products in the following chemical reaction?

C6H12O6 + 6 H2O + 6 O2 → 6 CO2 + 12 H2O

A) CO2 and H2O

B) C6H12O6, H2O, and O2

C) O2 only

D) C6H12O6, H2O, O2, CO2, and H2O

 

12. Relative to a pH of 3, a pH of 7 has a .

A) 400 times lower H+ concentration

B) 10,000 times lower H+ concentration

C) 4 times higher H+ concentration

D) 10,000 times higher H+ concentration

 

13. A substrate binds to an enzyme by interacting with amino acids in the ?

A) dehydration reaction

B) binding site

C) hydrolysis site

D) denaturation portal

 

14. Which component of the following reaction is the substrate, and which is the enzyme? sucrose + sucrase + water → sucrase + glucose + fructose

A) sucrose is the substrate, and sucrase is the enzyme

B) sucrase is the substrate, and sucrose is the enzyme

C) glucose is the substrate, and water is the enzyme

D) fructose is the substrate, and glucose is the enzyme

 

 

 

15. If one strand of a DNA double helix has the sequence AGTACTG, what will be the sequence of the complementary DNA strand?

A) GACGTCA

B) UCAUGAC

C) GUCAUGA

D) TCATGAC

E) impossible to tell from the information provided.

 

 

 

16. One difference between eukaryotic and prokaryotic cells is that eukaryotic cells prokaryotic cells.

A) are found in animals, while plants are comprised of

B) have membrane-enclosed organelles, which are lacking in

C) have a plasma membrane, which is lacking in

D) have a nucleoid region, which is lacking in

 

 

17. A protist that contains contractile vacuoles in its cytoplasm most likely lives

.

A) in a marine environment

B) within the cells of another organism

C) in fresh water

D) where it can climb on vertical surfaces

 

18. Similar to the nucleus, chloroplasts and mitochondria are .

A) surrounded by two membranes

B) green

C) manufactured by the nucleolus

D) able to synthesize lipids

 

19. The endomembrane system includes .

A) ribosomes, lysosomes, vacuoles, and the endoplasmic reticulum

B) Golgi apparatus, ribosomes, vacuoles, and the endoplasmic reticulum

C) Golgi apparatus, lysosomes, ribosomes, and the endoplasmic reticulum

D) Golgi apparatus, lysosomes, vacuoles, and the endoplasmic reticulum

 

20. Which of the following processes could result in the net movement of a substance into a cell, if the substance is more concentrated within the cell than in the surroundings?

A) active transport

B) facilitated diffusion

C) diffusion

D) osmosis

 

21. If placed in tap water, an animal cell will undergo lysis, whereas a plant cell will not. What accounts for this difference?

A) expulsion of water by the plant cell’s central vacuole

B) the relative impermeability of the plant cell membrane to water

C) the relative impermeability of the plant’s nuclear membrane to water

D) the relative inelasticity and strength of the plant cell wall

 

 

 

22. Which of the following is not a common feature shared by all metabolic pathways?

A) Each pathway contains multiple intermediate products, and there are small molecular differences between the intermediates.

B) Each pathway is regulated to ensure the optimal use of resources and to maintain the health of the cell.

C) Many pathways are universal among living organisms.

D) Each step within the pathway, or the conversion from one intermediate to the next, is catalyzed by a nucleic acid with a reactive R group.

 

Use the following information to answer questions 23-24 below.

 

A group of medical researchers recently investigated the effects of Drug X on lowering blood pressure in a group of hypertensive middle-aged men. The researchers did the following experiment and obtained the indicated results: One group of 150 men took a tablet containing Drug X for 3 weeks – 95 of these men decreased their blood pressure by at least 10% (three men from this group dropped out of the study). Another group of 150 men was given a tablet with no added Drug X for 3 weeks – 10 of these men decreased their blood pressure by at least 10% (two men from this group dropped out of the study).

 

23. Which of the following was the control group in this experiment?

A) the group of participants that received tablets containing Drug X

B) the group of participants that received tablets that did not contain Drug X

C) the number of participants in each group at the beginning of the experiment

D) the number of participants in each group at the end of the experiment

E) the amount of Drug X contained in the tablet

 

24. Which of the following is the most reasonable and accurate conclusion based on the results obtained in this experiment?

A) Drug X is good for hypertensive men

B) Drug X is good for both men and women

C) Hypertensive men receiving Drug X for 3 weeks may show a decrease in blood pressure

D) Hypertensive men receiving Drug X for 3 weeks may show an increase in blood pressure

E) Drug X has no effect on blood pressure

 

 

 

 

25. Plant cells .

A) do not need chloroplasts because their mitochondria meet their energy needs

B) have chloroplasts and mitochondria

C) use carbon dioxide but do not use oxygen

D) do not need mitochondria because their chloroplasts meet their energy needs

E) are prokaryotic

 

 

 

26. The ultimate source of the energy in food is .

A) the sun

B) producers

C) ATP

D) consumers

E) lipids and nucleic acids

 

27. What compound directly provides energy for cellular work?

A) C6H12O6

B) glucose

C) ATP

D) fat

 

 

 

28. child is born with a rare disease in which mitochondria are missing from certain skeletal muscle cells. Physicians find that the muscle cells function. Not surprisingly, they also find that .

A) the muscles contain large amounts of lactic acid following even mild physical exercise

B) the muscles contain large amounts of carbon dioxide following even mild physical exercise

C) the muscles require extremely high levels of oxygen to function

D) the muscle cells cannot split glucose to pyruvic acid

 

 

 

29. The disease gonorrhea has become increasingly resistant to treatment with antibiotics. What is the most likely scientific explanation?

A) The gonorrhea bacteria learned to avoid antibiotics.

B) The gonorrhea bacteria changed their genes when they sensed antibiotics.

C) Antibiotic-sensitive gonorrhea bacteria died out, but antibiotic-resistant gonorrhea bacteria have flourished and persisted.

D) The antibiotic increased the mutation rate in the gonorrhea bacteria.

E) both b and d.

 

 

 

30. Which statement best describes the relationship between plants and animals on earth?

A) Plants produce O2 and sugars from CO2

B) Animals produce CO2 and H2O from sugars and O2

C) Plants produce O2 and sugars and animals produce CO2 and H2O

D) Animals produce O2 and sugars and plants produce CO2 and H2O

 

31. Think of the cell as a factory, in which the organelles are specialized sites of production. All cells have a power plant, the mitochondrion. Plant cells have an additional “reactor” for the production of usable energy. It is called the

.

 

A) Golgi body

B) rough endoplasmic reticulum

C) central vacuole

D) vesicle

E) chloroplast

 

 

32. A researcher planted seeds from four types of quinoa (Types A, B, C, and D) in a greenhouse to determine which type of quinoa grew the tallest. The plants were grown for 10 days and measured. The results are shown below. Choose the data set that demonstrates that Type C quinoa grew the tallest. A) A = 30 cm, B = 21 cm, C= 15 cm, D= 12 cm.

B) A = 22 cm, B = 11 cm, C= 25 cm, D= 4 cm

C) A = 2 cm, B = 5 cm, C= 1 cm, D= 2 cm

D) A = 30 cm, B = 12 cm, C= 28 cm, D= 1 cm

E) A = 21 cm, B = 12 cm, C= 20 cm, D= 15 cm

 

33. replicated chromosome consists of two joined at the .

A) diploid genes; locus

B) homologous chromosomes; crossing over point

C) genomes: centrosome

D) sister chromatids; centromere

 

34. Homologous chromosomes .

A) carry genes controlling the same inherited characteristics

B) include only the autosomes

C) are a set of chromosomes that the cell received from one parent

D) carry the same versions of all genes

 

35. In meiosis, how does prophase I differ from prophase II?

A) During prophase I there is one diploid cell; during prophase II there are two haploid cells.

B) During prophase I chromosomes line up single file in the middle of the cell; during

prophase II the chromosomes line up in double file in the middle of the cell.

C) During prophase I the chromosomes coil up; the chromosomes are not coiled up during prophase II.

D) In prophase I the sister chromatids are attached; in prophase II the sister chromatids are separated.

 

36. Genetic variation is accomplished by all but one of the following. Which is it?

A) the events of meiosis I

B) crossing over

C) independent assortment

D) the events of meiosis II

 

37. purebred plant that produces red seeds is crossed with a purebred plant that produces yellow seeds. The seeds of all of the offspring are red. Why?

A) The red allele is recessive to the yellow allele.

B) All of the offspring are homozygous red.

C) The red allele is dominant to the yellow allele.

D) The alleles are codominant.

 

38. This diagram of the human life cycle shows that .

 

 

 

A) meiosis produces a diploid zygote

B) meiosis produces haploid sperm and egg cells

C) fertilization produces a haploid zygote

D) a diploid zygote undergoes meiosis to produce an adult human

 

 

 

 

 

 

 

 

 

 

 

 

 

 

39. Attached earlobes are recessive to free earlobes. What genotypic and phenotypic ratios are expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

A) genotypic ratio = 2:1
phenotypic ratio = 50% attached earlobes: 25% free earlobes

B) genotypic ratio = 2:2 
phenotypic ratio = 2 attached earlobes: 2 free earlobes

C) genotypic ratio = 1:2:1
phenotypic ratio = 1 attached earlobes: 2: semi-detached earlobes: 1 free earlobes

D) genotypic ratio = 3:1
phenotypic ratio = 1 attached earlobes: 3 free earlobes

 

40. couple has two female children. What is the probability that their next child will be male?

A) 25%

B) 50%

C) 33%

D) 67%

 

41. What is the key to recognizing polygenic inheritance?

A) A mating between a homozygous and a heterozygous individual produces more than the expected number of offspring expressing the dominant trait.

B) All of the alleles of the gene for that trait are equally expressed.

C) Pleiotropy occurs.

D) The trait varies along a continuum in the population.

 

 

Please read the following scenario to answer the following question.

 

 Widow’s peak, a pointed hairline on the forehead, is a genetic trait caused by a somatic dominant allele. It can be traced back through a family’s history using pedigree analysis. The pedigree shown here shows three generations of a family. Notice that some individuals (shown in gray) have a widow’s peak (W = dominant allele and w = recessive allele).

 

 

 

 

42. Janice’s genotype is .

A) Ww

B) WW

C) ww

D) WW or Ww

 

 

 

 

 

 

43. After replication, .

A) each new DNA double helix consists of two old strands

B) each new DNA double helix consists of one old strand and one new strand

C) each new DNA double helix consists of two new strands

D) one new DNA double helix consists of two old strands and the other new DNA double helix consists of two new strands

 

44. Translation converts the information stored in to .

A) DNA… RNA

B) RNA… a polypeptide

C) DNA… a polypeptide

D) RNA… DNA

 

45. What is the smallest number of nucleotides that must be added or subtracted to change the triplet grouping of the genetic message?

A) one

B) two

C) three

D) four

 

46. What is the ultimate source of all diversity?

A) natural selection

B) sexual recombination

C) meiosis

D) mutation

 

 

Please read the following scenario to answer the following two question(s).

 

While working with cultured mouse cells, a researcher unknowingly treated the cells with a mutagen that causes the deletion or insertion of individual nucleotides in DNA. Subsequently, she isolated and cultured a single cell from this group. She noticed that the progeny of this cell were not producing a certain protein and that this affected their survival.

 

47. The mutation that resulted from her accident was probably .

A) an amino acid substitution

B) one that changed the triplet grouping of the genetic message

C) an error in translation

D) a loss in regulation of gene expression

 

48. The mutation would be most harmful to the cells if it resulted in .

A) a single nucleotide insertion near the start of the coding sequence

B) a single nucleotide deletion near the end of the coding sequence

C) a single nucleotide in the middle of an intron

D) deletion of a triplet near the middle of the gene

 

 

 

 

 

 

49. How are cells in different body tissues able to perform different functions?

A) The cells exhibit different patterns of gene expression.

B) Different chromosomes have been inactivated in different cells.

C) The cells contain different genes in their nuclei.

D) The mutations that have accumulated in the cells of the different tissues control functions.

 

50. Genetically modifying human cells may directly affect future generations.

A) intestinal

B) immune

C) gamete

D) somatic

E) B and D only

 

51. Ethical dilemmas raised by DNA technology and knowledge of the human genome include .

A) the potential for interfering in evolution

B) the safety of GM foods

C) the potential discrimination against people predisposed to certain diseases

D) all of the above

 

52. Which of the following are homologous?

A) the forelimb of a dog and the hindlimb of a cat

B) the forelimb of a dog and the forelimb of a cat

C) wings of a butterfly and wings of a sparrow

D) the mouth of a mosquito and the beak of a hummingbird

 

53. The similarity of the embryos of fish, frogs, birds, and humans is evidence of

.

A) analogy

B) common ancestry

C) genetic drift

D) convergent evolution

 

54. Which one of the following statements is true?

A) Natural selection works on variation already present in a population.

B) Natural selection works on non-heritable traits.

C) Individuals evolve through natural selection.

D) Organisms evolve structures that they need.

 

55. What does evolutionary fitness measure?

A) physical health of individuals

B) longevity

C) relative reproductive success within a population

D) population size and dispersion

 

56. Which of the following is most likely to decrease genetic variation?

A) directional selection

B) mutation

C) stabilizing selection

D) diversifying selection

 

57. In the soil, some convert nitrogen to a form that can be used by plants.

A) protists

B) animals

C) protozoans

D) prokaryotes

 

58. The evolved from small prokaryotes that established residence within other, larger prokaryotes.

A) vacuoles and lysosomes

B) Golgi apparatus and endoplasmic reticulum

C) centrioles and ribosomes

D) mitochondria and chloroplasts

 

59. What type of interspecific interaction is described by a small fish that eats parasites from mouths of larger fish?

A) mutualism

B) herbivory

C) parasitism

D) pollination

 

60. Antibiotic resistance is an example of what type of evolution?

A) Allopatric.

B) Microevolution.

C) Gene pool magnification

D) Macroevolution.

 

61. Biomedical researchers study species as disparate as worms, fruit flies, mice, zebrafish, or rhesus monkeys to understand our genes, and even our diseases. Why?

 

A) Because these species have many inherited features that are very similar to our own.

B) Because these species are all prokaryotes, and therefore their genes are 99.9% identical to one another

C) Because they make up an interconnected food web when bacteria are added

D) Because rhesus monkeys gave us the Rh+ factor when they bit our ancestors

 

62. Unique features of all vertebrates include the presence of a(n) .

A) scales

B) mammary glands

C) skull and backbone

D) amnion

 

63. Consider the following food chain: A barn owl eats a shrew. This shrew has eaten a grasshopper. The grasshopper has eaten the leaves of a clover plant and a maple tree. What organisms are on the first trophic level?

A) the barn owl

B) the shrew

C) the grasshopper

D) the barn owl, the shrew and the grasshopper

E) the clover plant and maple tree

 

64. Water moves from land to the atmosphere through .

A) precipitation only

B) transpiration only

C) transpiration and evaporation

D) evaporation and precipitation

 

65. According to this evolutionary tree, approximately how many years ago did humans and orangutans share a common ancestor?

 

A) 1 million years ago

B) 7 million years ago

C) 12 million years ago

D) 20 million years ago

 

66. Which of the following is not a result of global warming?

A) changes in the breeding seasons of some species.

B) decreasing sea levels.

C) melting permafrost.

D) shifts in the ranges of some species.

 

 

 

67. Which of the following are not examples of renewable resources?

A) Biofuels produced from plants or plant-derived by-products such as crop wastes.

B) Power supplied by human labor or livestock.

C) Fertilizers made from animal manure and composted plants.

D) Metal, cement, and glass, made using mined materials.

 

Please read the following scenario to answer the following two question(s).

 

Salmon eggs hatch in freshwater streams and, during the first year of their life, the young salmon migrate up to 1,000 km to the ocean. They spend varying amounts of time in the ocean (ranging up to five years), where they feed and grow, rapidly acquiring more than 95% of their biomass during this period. During the summer of their maturing year, they begin the long journey back to their home streams where they spawn. Although it is still uncertain how salmon navigate back to their spawning grounds, current hypotheses suggest that they have a highly developed sense of smell. At the spawning grounds, females use their tails to form a hollow cavity where they lay up to 8,000 eggs. The male fertilizes the eggs, and both adults typically die soon thereafter.

 

68. The physiological response that allows salmon to survive in fresh water, then in salt water, and then fresh water again is an example of .

A) a behavioral response

B) evolution

C) acclimation

D) an anatomical response

 

69. At different times in their lives, salmon can be found in all of the following

except .

A) a freshwater biome

B) a chaparral

C) the pelagic realm

D) an estuary

 

 

 

 

70. In an ideal, unlimited environment, what shape does a population’s growth curve most closely resemble?

A) S

B) J

C) ∧

D) âˆȘ

 

 

 

71. According to the logistic growth model, what happens to a population when the size of the population reaches carrying capacity?

A) The growth rate remains unchanged.

B) The growth rate begins to decrease in size.

C) The population crashes.

D) The growth rate is zero.

 

72. Non-native species can have influence biological communities by .

A) preying upon native species

B) competing with native species for resources

C) reducing biodiversity

D) doing all of the above

 

73. species exerts a particularly strong influence on an ecosystem out of proportion to its size or abundance; its decline or extinction can cause a cascade of future extinctions within an ecosystem.

A) commensal

B) trophic

C) keystone

D) groundwater

 

 

 

74. An example of a mutualism, or +/+ relationship, is .

A) the relationship between corals and unicellular algae

B) cryptic coloration in frogs

C) herbivory

D) the relationship between Virginia’s warblers and orange-crowned warblers, which use some of the same resources

 

75. Populations of two coexisting species are both tertiary consumers in a community. What relationship may exist between these two organisms?

A) predation

B) mutualism

C) competition

D) commensalism

 

76. On average, only about of the available energy in one trophic level is incorporated and stored as calories in the bodies of the next level up.

A) 10%

B) one-third C) 50%

D) 75%

 

77. The primary goal of conservation biology is to by .

A) catalog species; protecting federally listed endangered species

B) maximize the land set aside for wildlife; countering pollution

C) integrate human culture back into nature; maintaining genetic diversity within species

D) counter the loss of biodiversity; sustaining entire ecosystems and habitats

 

Use the following information to answer the following three questions.

 

Malaria is an infectious disease caused by a unicellular eukaryotic organism belonging to the genus Plasmodium. These eukaryotic organisms are transmitted from one person to another by the female Anopheles mosquito when it feeds on human blood. Within humans, the Plasmodium spp. destroy red blood cells and, without effective treatment, serious infections can lead to death. Currently, more than 400 million people are afflicted with malaria and between 1 to 3 million people die from it each year. Historically, a chemical compound called quinine has been used in developing effective drugs against malaria. In its natural environment, quinine is produced by certain trees native to South America. This chemical is synthesized in the outer layer of tree trunks and acts as an herbivore deterrent.

 

78. Based on the relationship between Plasmodium spp. and humans, these organisms would be considered .

A) parasites

B) hosts

C) producers

D) carnivores

 

 

 

79. Humans, mosquitoes, and Plasmodium together would be considered a(n)

.

A) population

B) community

C) ecosystem

D) population and community

 

 

 

80. Despite being used for many years, quinine-based drugs have not led to the eradication of malaria and currently there are mosquitoes that are resistant to the compound. Which of the following were likely important in the development of this resistance to quinine?

A) natural selection

B) mutualism

C) interspecific competition

D) biological magnification

 

****************************************************************************************************

 

 

TERM or CONCEPT Answer Definition/Association
1. genetic drift   A. DNA molecule with attached proteins
2. chromosome   B. a haploid cell that combines with another haploid cell during fertilization
3. crossing over   C. a specific portion of a chromosome that contains information for a particular inherited trait
4. gamete   D. New species form in geographically isolated populations
5. gene   E. an interaction during meiosis in which chromatids exchange segments; results in genetic recombination
6. germ cell   F. a change in the gene pool of a population due to chance
7. sympatric speciation   G. the process in which ribosomes synthesize proteins using the mRNA transcript
8. mitosis   H. the synthesis of mRNA from a DNA template
9. translation   I. the type of cell division which is used in asexual reproduction and tissue growth and repair
10. transcription   J. the type of cell division responsible for gamete formation and sexual reproduction
11. allopatric speciation   L. a type of cell whose primary function is the formation of gametes for sexual reproduction
12. meiosis   M. New species form within populations in the same geographic area

 

 

MATCHING SECTION #1 (6 points)

MATCHING SECTION INSTRUCTIONS: Read all instructions carefully. Please answer all questions. Each question is worth 0.5 points. Type in the letter you select from the right column as the best answer on the Answer Sheet provided by your instructor.

 

 

 

TERM or CONCEPT Answer Definition/Association
1. microtubules   A. contain enzymes for intracellular digestion
2. chloroplasts   B. are primary cellular structures (or components) where proteins are assembled
3. Golgi bodies   C. package cellular secretions for export
4. DNA molecules   D. extract energy stored in carbohydrates; synthesize ATP; produce water and carbon dioxide
5. RNA molecules   E. synthesize subunits that will be assembled into two part ribosomes in the cytoplasm
6. central vacuoles   F. translate hereditary instructions into specific proteins
7. lysosomes   G. increase cell surface area; store substances
8. mitochondria   H. encode hereditary information
9. nucleoli   I. help distribute chromosomes to the new cells during cell division
10. ribosomes   J. convert light energy to chemical energy stored in the chemical bonds of glucose or starch

 

 

 

FILL IN THE BLANK SECTION (12 points)

 

INSTRUCTIONS: Provide the best answer for the items below. Each item is worth three (3) points. Please answer all questions in this section. Type in your best answer on the Answer Sheet provided by your instructor.

 

1. You take a sample from a mysterious “blob” that has washed up on the shore of a nearby lake, and view the cells and their contents under a very high-resolution microscope. You can see that the cells are polygonal and you can identify the cell membrane, mitochondria, chloroplasts, the nucleus, and some Golgi bodies. You conclude that it must be a cell.

 

2. A resists changes in pH by accepting hydrogen ions from or donating hydrogen ions to solutions.

 

MATCHING SECTION #2 (5 points)

MATCHING SECTION INSTRUCTIONS: Read all instructions carefully. Please answer all questions. Each question is worth 0.5 points. Type in the letter you select from the right column as the best answer on the Answer Sheet provided by your instructor.

 

 

 

3. A dog gets many nutrients from its food including amino acids. What macromolecule can be built directly from amino acids?

 

4. selection can lead to a balance of two or more contrasting phenotypes in a population.

 

SHORT ANSWER SECTION

INSTRUCTIONS: Each question is worth two (2) points. Total points for this section is 12 points. Complete 6 questions in this Short Answer Section.

 

**Do not enter your answers here.** Type your answers into the Answer Sheet provided by your instructor.

 

1. Lithops, also called Stoneplants, are a type of plant that resembles little stones. These plants have the ability to blend in with their surrounding, which affords them protection from predators. If you were in an area containing Lithops, describe four characteristics you could identify to distinguish these plants from the stones they mimic.

 

2. A population of grasshoppers in the Kansas prairie has two color phenotypes, green and brown. Typically, the prairie receives adequate water to maintain healthy, green grass. Assume a bird that eats grasshoppers moves into the prairie. How will this affect natural selection of the grasshoppers? How might this change in a drought year?

 

3. DNA and RNA are similar yet distinct components of the cell. Describe three differences between RNA and DNA with respect to their chemical composition and structure. Describe in detail each characteristic you chose in your response.

 

4. When does a logistic population growth curve show the highest rate of growth? Why?

 

5. Soil pH determine what types of plants will grow the best. If soil is too acidic, lime can be added, and if it is too basic, peat moss can be added. You test your soil and find that its pH is 3.5, and you want to grow cucumbers, which prefer to grow in soils in the 7.5-

8.5 range. Would you add lime or peat moss to adjust your soil’s pH? Why?

 

6. The total solute concentration in a red blood cell is about 1-2%. Sucrose cannot pass through a red blood cell’s plasma membrane, but water and urea can. Osmosis will cause a red blood cell to expand the most when placed in which of the following solutions? Explain your answer.

A. a hypertonic sucrose solution

B. a hypotonic sucrose solution

C. a hypertonic urea solution

D. a hypotonic urea solution

 

 

 

 

ESSAY SECTION

ESSAY. Eight Essays @ 10 points each. Total points for this section is 80 points. INSTRUCTIONS: Choose and answer eight (8) essay questions from the list below. The full number of points will be awarded for accurate and complete answers. Partial credit will be given for less than thorough answers, so answer eight essay questions from the list. If you answer more than eight, I will grade the first eight that you answer. Remember to address all parts of a question.

 

**Do not enter your answers here.** Type your answers into the Answer Sheet provided by your instructor. Indicate the number of the question you selected on the answer sheet.

 

1. Before bringing a new drug to the marketplace, extensive testing is done on the drug by administering the drug to large numbers of individuals. Explain the importance of the scientific method, sample size, controls and variable in the drug evaluation process.

 

 

2. List the four “large molecules of life.” Identify their composition (building blocks) and structure, and describe one function they each perform in the cell.

 

 

3. How can you explain the occurrence of birth defects (caused by altered genes) in children and grandchildren of WWII atomic bomb victims, when the victims themselves were only mildly affected?

 

 

4. During the past 50 years, more than 200 species of insects that attack crop plants have become highly resistant to DDT and other pesticides. Based on what you have learned in this class regarding evolution, explain the rapid and widespread evolution of resistance. Now that DDT has been banned in the US, what do you expect to happen to levels of resistance to DDT among insect populations in the US? Why?

 

 

5. Water is crucial for life as we know it. One of the most important characteristics of water is its ability to act as a solvent. Explain why water is such a good solvent for polar and charged molecules.

 

 

6. Tobacco is the leading cause of preventable cancers today. In fact, there are very few known cancers for which smoking is not considered a risk factor. The relationship between cigarette smoking and disease has been studied for years. How can this problem be studied at many different levels of biological organization? Give some examples.

 

 

 

7. Predict what will happen in the following experiment based on what you know about photosynthesis and cellular respiration.

a. You place a plant alone in a covered airtight container in the presence of sunlight.

Assume a watering system is provided. What will happen to the plant (will it live or die), and why?

b. You place a butterfly alone in a covered airtight container with nectar and a source of water. What will happen to the butterfly, and why?

c. You place a plant and a butterfly together in a covered airtight container with food, water, and sunlight. What will happen to the plant and the butterfly, and why?

 

8. a. You are comparing two cells. One cell is very small, and the other cell is huge.

Under which conditions would you expect the larger cell to be more successful, or the small cell to be more successful? Give a specific explanation for your answer.

b. Explain why animal cells would be unable to exist without the presence of plant cells. Is this relationship reciprocal?

 

9. Two examples of chemotherapeutic drugs (used to treat cancer) and their cellular actions are given below. Explain why each drug could be fatal to a cancer cell.

a. Vincristine: damages the mitotic spindle

b. Adriamycin: binds to DNA and blocks messenger RNA synthesis

c. Compare and contrast tumor suppressor genes and proto-oncogenes. Which of these must mutate to produce cancer?

 

10. a. Cystic fibrosis is a recessive genetic disease. Two parents do not have cystic fibrosis; however, their child does. Fully explain how this could have happened using a Punnett square.

b. Hypophosphatemia (vitamin D-resistant rickets) is inherited as an sex-linked dominant trait. The relevant gene is found on the X chromosome. What is the expected genotypic ratio and phenotypic ratio of a cross between a homozygous recessive woman and a man with hypophosphatemia? Explain your answer using a Punnett square.

 

10. With the ability to clone animals, such as endangered species, their population numbers can be increased in a short time. How would cloning a population of animals from a one or a few individuals impact these populations from the perspective of the gene pool and genetic variability?

 

11. a. Explain why it takes about the same amount of photosynthetic productivity to produce 10 kilograms of corn as 1 kilogram of bacon.

 

b. Why do food chains and food webs typically have only three to five levels?

 

 

 

 

 

 

BONUS QUESTIONS (6 points)

Instructions: Type in the letter that represents your best answer to the questions below. Each question is worth 2 points. Total points for this section is 6 points; no penalty for incorrect answers.

 

1. Which of the following demonstrates the correct use of a parenthetical in-text citation formatted in APA style?

 

A) According to Simon, Dickey and Reece, roughly half the corn crop in the U.S. is genetically modified. (2013).

B) Glycolysis produces O2 even in the absence of oxygen. Simon, Dickey and Reece, (Essential Biology)

C) According to Simon, Dickey and Reece (2013), vacuoles bud from the ER, Golgi apparatus, or plasma membrane.

D) Gel electrophoresis has many uses besides STR analysis. (Simon, Dickey & Reece, 2013)

E) An endospore is a thick-coated protective cell produced within a prokaryotic cell under harsh conditions (Essential Biology, Simon, Dickey & Reece).

F. None of the above.

 

 

2. Which of the following journal articles is documented correctly in APA style?

 

A) Madison, Portia Lee. “How exams affect heart rate.” Journal of Cardiac Stress. 26.2 (2005): 168-180.

B) Madison, P. L. (2005). How exams affect heart rate. Journal of Cardiac Stress, 26(2), 168-180.

C) Portia Lee Madison, 2005, How exams affect heart rate, Journal of Cardiac Stress, Volume 26, (2), 168-180.

D) Journal of Cardiac Stress. (2005). How exams affect heart rate. P. L. Madison. P.

 

168.

 

E) Madison, Portia L. (2005). “How exams affect heart rate.” Journal of Cardiac Stress.

 

26.2 (2005): 168-180.

 

F. None of the above.

 

 

 

3. For APA format, the reference sources at the end of your paper should be

 

A) numbered in the order in which they are cited in the text of the paper.

 

B) listed under separate subheadings according to the type of source (book, film journal article, website, etc.).

 

C) listed first by sources with authors, then by those without authors, then by those without publication years.

 

D) in alphabetical order by authors’ surname or by organization (if there is no author), regardless of the type of reference (book, film journal article, website, etc.).

 

E) in order of publication year (oldest references first, then the most recent last).

 

You have completed the exam.

 

Congratulations on completing BIO 103

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