UMUC Biology 102/103 Lab 6: Taxonomy

 

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UMUC Biology 102/103

Lab 6: Taxonomy

INSTRUCTIONS:

 

·         On your own and without assistance, complete this Lab 6 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 6 Answer Sheet in the following format:  LastName_Lab6 (e.g., Smith_Lab6).

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

 

Pre-Lab Questions

 

  1. Use the following classifications to determine which organism is least related out of the three. Explain your rationale.
Table 2: Classifications
  Classification Level American Green Tree Frog European Fire- Bellied Toad Eastern Newt
Domain Eukarya Eukarya Eukarya
Kingdom Animalia Animalia Animalia
Phylum Chordata Chordata Chordata
Class Amphibia Amphibia Amphibia
Order Anura Anura Caudata
Family Hylidae Bombinatoridae Salamandridae
Genus Tursipops Bombina Notophthalmus
Species cinerea bombina viridescens

 

 

  1. How has DNA sequencing affected the science of classifying organisms?

 

 

 

 

  1. You are on vacation and see an organism that you do not recognize. Discuss what possible steps you can take to classify it.

 

 

Exercise 1: Dichotomous Key Practice

 

Table 3: Dichotomous Key Results
Organism Binomial Name
i  
ii  
iii  
iv  
v  
vi  
vii  
viii  
ix  
x  
xi  
xii  
xiii  

 

 

Post-Lab Questions

1.    What do you notice about the options of each step as they go from number one up?

 

 

2.    How does your answer from Question 1 relate to the Linnaean classification system?

 

 

 

Exercise 2: Classification of Organisms

Data Tables and Post-Lab Assessment

Table 2: Key Characteristics of Some Organisms

Organism Kingdom  

Domain

Defined Nucleus Motile Cell Wall Photosynthesis Unicellular
E. coli         Yes   Yes
Protozoa     Yes Yes     Yes
Mushroom     Yes   Yes    
Sunflower     Yes   Yes Yes  
Bear     Yes Yes      

 

lab006fig004
Figure 4:Exercise 2 – Classification of Organisms Flow Chart

 

 

Post-Lab Questions

 

1.    Did this series of questions correctly organize each organism? Why or why not?

 

2.    What additional questions would you ask to further categorize the items within the kingdoms (Hint: think about other organisms in each of the kingdoms and what makes them different than the examples used here)?

 

 

3.    What questions would you have asked instead of the ones that you answered above when classifying the organisms?

 
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Lab: RNA

Lab: RNA

In this lab, you will learn about the types of RNA molecules and you will study the details of transcription and translation.

Objectives:

Learn about the types of RNA molecules produced by cells.
Study the details of transcription and translation.

Time Requirements:

This lab should take two hours to complete.

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RNA Lab Report

If a codon is mutated, say from GGU to CGU, is the same amino acid specified? _______

Using information from the course and online research, answer the questions.

Searching Websites:

Conduct a keyword search to find websites. To begin a keyword search, start by searching broad terms such as RNA, transcription, translation, or the scientist’s name. The resulting list of websites can give you a lot of information, but how do you know if it is reliable? Some basic guidelines can help you when you open a website and try to determine its reliability.

Always consider a site’s:

· Objectivity – Excessive expressions of emotion, opinions, and stereotyping are tip-offs that the information on a site may be biased.

· Ownership and contributors – Go to the Home or About page of the website and find out who sponsors and writes for the site. Look for contributors who have reliable credentials, such as “Harvey Jones, Professor, University of Wisconsin—Madison.”

· Writing style and mechanics – Check the grammar, spelling, and writing style on the site. Errors and awkwardness are signs of a nonprofessional website.

· Currency – Look for publication or copyright dates associated with the site; the more current the better.

· Links – What links does the site contain? A reliable website will offer links to other reliable websites, not to “junk” sites.

Keyword Search: RNA, transcription, translation, or the scientist’s name.

Scientific Analysis:

1. Scientists use observations and inferences for many discoveries and conclusions in genetics. What is the difference between an observation and an inference? Give an example of each.

2. If DNA from a cell is placed in a test tube containing the enzyme DNA polymerase and nucleotides, the result is new copies of the original DNA. This evidence was used to understand DNA replication (DNA passing information from one generation to the next). Write an explanation detailing why this clue represents solid data and is not an opinion or an inference.

3. In your own words, describe Crick’s Central Dogma. Explain why this is an inference.

Scientific Contributions

There were many scientists that contributed to decoding the genetic code. Explore the contributions of some scientists.

4. Describe Marshall Nirenberg’s contribution to determining the role of RNA in genetics.

5. Describe how Seymour Benzer’s phage experiments contributed to deciphering the genetic code.

6. Describe Seymour Brenner’s contribution to cracking the genetic code with respect to translation.

Replication, Transcription, and Translation

Place an x in the box for which process each item is a characteristic.

Characteristic Replication Transcription Translation
1. RNA polymerase unwinds the DNA double helix.      
2.  This is the first part of protein synthesis.      
3. After the stop codon is reached, the protein is separated from the ribosome.      
4. Amino acids sequences are made from RNA sequences.      
5. A copy of RNA is made from DNA.      
6. Peptide bonds form between amino acids.      
7. Uracil hydrogen bonds with adenine.      
8. tRNA brings amino acids to the ribosome.      
9. Copies of the original DNA are made.      
10.  Thymine hydrogen bonds with adenine.      

 

7. Use the table and your research to compare and contrast transcription and translation.

8. In your own words, explain the function of mRNA, tRNA, and rRNA.

9. Use the codon chart to convert this sequence into an amino acid:

UCU-CGA-GCC-GUU-GGG-UGA

10. Explain why an mRNA strand composed of only uracil nucleotides (UUUUUUUUUU) did conclusively prove that the DNA code was a triplet code.

11. How could this mRNA sequence support a triplet code? ACACACACACAC

12. List the steps involved in protein synthesis, beginning with the DNA code in the nucleus and ending with a polypeptide. Try to explain it in 10 steps.

13. A mutation in a codon may not result in a change of an amino acid in the protein sequence. Explain why, using the genetic code chart to give an example.

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The Lower Limit Of The Intertidal Zone Is The

Question

1 of 25

The lower limit of the intertidal zone is the

average high tide.

average middle tide.

lowest tide.

lowest edge of the rocky substrate.

None of the above choices are correct: it varies according to type of substrate.

Question

2 of 25

The particular characteristic most widely used in classifying intertidal communities is which of the following?

Type of tides

Relative exposure to air

Type of substrate

Type of seaweeds

Relative immersion by water

Question

3 of 25

Which of the following strategies is not used to avoid desiccation in the intertidal?

Closing shells

Crowding in areas that are always moist

Burrowing into substrate

Mucus

Moving out of tide pools

Question

4 of 25

Most sessile animals living on rocky shores are which of the following?

Deposit feeders

Carnivores

Detritus feeders

Filter feeders

Grazers

Question

5 of 25

If a rocky shore highly exposed to wave action is compared to a similar rocky shore that is a lot less exposed to wave action, one should expect that barnacles living on the more exposed shore show a

wider vertical distribution.

narrower tolerance to salinity.

narrower tolerance to temperature.

narrower vertical distribution.

higher resistance to predators.

Question

6 of 25

Byssal threads are used by mussels to cope with.

desiccation.

wave shock.

restricted feeding.

salinity changes.

temperature changes.

Question

7 of 25

Vertical zonation on rocky shores is mostly the result of differences in tolerance to

 

wave action.

exposure.

predation.

light.

salinity.

Question

8 of 25

This organism is typical of the upper intertidal on rocky shores.

Mussels

Barnacles

Sponges

Sea anemones

Periwinkles

Question

9 of 25

The middle intertidal is characterized by which of the following?

Constant wetting by splash and spray

Long exposure to air

Steady immersion

Exposure and immersion on a regular basis

Splashing during high tide and complete exposure at low tide

Question

10 of 25

Intertidal organisms from exposed areas sometimes have thicker shells than their counterparts from less exposed areas. This is thought to be an adaptation to

desiccation.

restricted feeding.

wave shock.

salinity changes.

temperature changes.

Question

11 of 25

Predation by sea stars on rocky shores ultimately results in

fewer species.

less wave action.

a decrease in the number of seaweeds.

an increase in the number of mussels.

more species.

Question

12 of 25

Ecological succession ultimately results in

a climax community.

an upper-limit stage.

competitive exclusion.

keystone predation.

vertical zonation.

Question

13 of 25

Which of the following is generally considered to be the greatest limiting resource in the rocky intertidal?

Salinity

Space

Prey

Availability of mates

Light availability

Question

14 of 25

Which of these organisms is typically a very rare component of soft-bottom intertidal communities?

Burrowing organisms

Detritus feeders

Seaweeds

Infauna

Deposit feeders

Question

15 of 25

Most animals living on sandy beaches are included among which of the following?

Infauna

Deposit feeders

Macrofauna

Producers

Grazers

Question

16 of 25

Fine sediments are characteristic of

shores exposed to wave action.

rocky shores.

areas with wide temperature fluctuations.

calm, less exposed shores.

areas that experience considerable water flow.

Question

17 of 25

The interstitial water in muddy bottoms

has plenty of oxygen since temperature is much higher than in the water column.

accumulates oxygen as a result of photosynthesis by inhabitants of the sediment.

recirculates oxygen very frequently so it is high.

is deficient in oxygen.

is deficient in oxygen but only during the day.

Question

18 of 25

The main source of food in muddy-bottom intertidal communities is

seaweeds

detritus

plankton

large prey

epifauna

Question

19 of 25

On Atlantic shores, the dog whelk (Nucella lapillus) has two color forms: white-shelled and brown-shelled. Survival of one form over the other form in a region appears to be related to

temperature.

salinity.

substrate type.

prey availability.

predators.

Question

20 of 25

What organism would be most likely to be found in the upper intertidal zone of a rocky shoreline?

Mussels

Seaweed

Encrusting algae

Barnacles

Irish moss

Question

21 of 25

In soft-bottomed intertidal communities, locations with strong waves and currents are most likely to have which type of bottom?

Gravel

Sand

Silt

Clay

Mud

Question

22 of 25

Meiofauna live

on rocky shores.

on sandy bottoms.

between grains of sediment.

in burrows.

in the water column.

Question

23 of 25

A species that significantly influences the structure and diversity of its community is a ______________.

predator species

keystone species

prey animal

primary producer

apex predator

Question

24 of 25

The best reason for putting a cage over certain organisms in an intertidal study area is so that __________________.

other organisms can be kept out of the study area

biologists can control when certain animals mate

their respiration rates can be measured

they can be removed from the area

body measurements can be taken

Question

25 of 25

Two sediments that are very rich in detritus are ______________.

sand and gravel

sand and clay

silt and gravel

clay and sand

silt and clay

 

 
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A+ Answers Of The Following Questions 136627

1. Among the advanced technologies used to study the brain’s structure and functions, which one provides detailed three-dimensional images of the brain’s structures and activities?

A. Transcranial magnetic stimulation

B. Positron emission tomography

C. Functional magnetic resonance imaging

D. Electroencephalogram

2. In conducting an experiment, the experimenter divides a sample group of 60 children into two groups of 30 called group A and group B. To make sure the two groups are similar in terms of age, IQ, and so on, the experimenter will assign people to either group A or B using a/an ________ assignment procedure, such as a coin toss, where heads sends a subject to group A and tails sends a subject to group B.

A. experimental

B. independent

C. random

D. subjective

3. Within the cerebral cortex, the _______ area is found in the occipital lobe.

A. visual

B. association

C. somatosensory

D. main auditory

1. By means of introspection, Dr. Marsh attempts to determine the components of things like perception, thinking, and consciousness. By contrast, Dr. Smyth wants to understand what the mind does in producing different kinds of behavior. We can reasonably assume that Dr. Marsh’s research is mainly guided by the principles of

A. Gestalt psychology.

B. functionalism.

C. structuralism.

D. objectivism.

2. According to a Gestalt principle called _______, when we’re looking at a crowd of people, we tend to perceive people grouped close together as belonging to a common or related group.

A. simplicity

B. closure

C. expectancy

D. proximity

3. Dr. Lombard’s research is focused on the capacity of the human mind to store and retrieve information. Her colleague, Dr. Fry, is a clinician who strives to help his clients be “the best that they can be.” As a fly on the wall listening to the two psychologists’ friendly disputes during coffee breaks, which of these assertions would you most likely expect from Dr. Fry?

A. People can’t be held responsible for their life choices.

B. A person’s basic assumptions about themselves are inevitably false.

C. Mental confusion is best compared to a deficiency in short-term memory.

D. If biology is destiny the concept of free will can be only an illusion.

1. Agatha maintains that people are capable of freely making voluntary choices. Constance is mainly focused on how aggression is caused by genetic inheritance. It seems reasonable to assume that Constance is not much interested in environmental factors impacting behavior while Agatha rejects

A. determinism.

B. mental processes.

C. heredity.

D. introspection.

2. Regarding the association areas of the cerebral cortex, which of the following statements is most accurate?

A. Association areas are to thinking as neuroplasticity is to language.

B. Changes in personality may indicate damage to the association areas.

C. Most association areas are located in the left cerebral hemisphere.

D. The association areas are largely responsible for neurogenesis.

3. In the ear, the basilar membrane and hair cells are found in the

A. oval window.

B. auditory nerve.

C. anvil and stirrup.

D. cochlea.

1. A clinical experiment is designed in such a way that neither the researchers dispensing a treatment nor the persons in the experimental or control groups know if they’re getting a sugar pill or a new drug. This sort of experimental design is employing a/an _______ procedure.

A. double-blind

B. reverse psychology

C. placebo

D. experimenter expectations

2. In his research, Dr. Caulfield wants to compare levels of test anxiety among high school students in grades 10 and 12. His hypothesis is that seniors will have higher levels of test anxiety than sophomores will. His _______ definition of test anxiety for each person in his sample will be a self-reported test-anxiety level, marked in a questionnaire as “high,” “moderate,” or “low.”

A. subjective

B. theoretical

C. functional

D. operational

3. I study a sample of 100 high school students and find that student IQ scores increase significantly as the level of reported parental income increases. I can conclude from this that

A. there’s a negative relationship between parental income and children’s IQ scores.

B. there’s a positive correlation between parental income and children’s IQ scores.

C. higher parental income causes an increase in children’s IQ scores.

D. students get smarter when their parents earn more money.

4. Jason argues that the pituitary gland’s main purpose is regulating the activity of other glands in the body. Barbara maintains that the pituitary gland also regulates growth. Who is correct?

A. Neither Jason nor Barbara is correct.

B. Barbara is correct.

C. Jason is correct.

D. Both Jason and Barbara are correct.

1. According to information provided in your text, circadian rhythms are associated with

A. the occurrence of anxiety attacks.

B. cycles of waking and sleeping.

C. attacks of sleep apnea.

D. the time of month that pregnant women are likely to go into labor.

2. During the _______ phase of problem solving, a means-ends analysis is a very common heuristic.

A. judgment

B. preparation

C. production

D. algorithm

3. In a lab devoted to sleep disorders Julio points to the brain wave monitor, turns to Laura and says, “Subject is going into non-REM Stage 2.” Laura looking at the monitor, says, “Got it; I’m recording the time.” What would Laura and Julio see on the monitor to assure them that the subject has entered Stage 2 sleep?

A. Brain waves are getting slower and more regular.

B. Sleep spindles appear.

C. Brain waves are irregular and episodic.

D. Sleep disturbance is indicated by sharp wave spikes.

 

 
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