Download B 262, F 2000 – T -H

Name
BIOLOGY 262, FALL 2000 – TAKE-HOME EXAM
EXAMINATION #2 (PART 1)
Date
MULTIPLE CHOICE.For the following multiple choice questions circle the letter in front of the
response that best answers the question or completes the sentence. (20%, 2% each)
6. Which of the following is how the human
1. A bacterium that obtains both its energy
insulin gene was introduced into E. coli?
from chemical compounds and its carbon
a. binary fission
from carbon dioxide is a….
b. conjugation
a. chemoautotroph.
c. transcription
b. chemoheterotroph.
d. transformation
c. photoautotroph.
e. None of the above
d. photoheterotroph.
e. None of the above
7. Which of the following best describes the
relationship of an E. coli bacterium in your
2. In a population at Hardy-Weinberg
intestine helping digest food to you?
equilibrium, if the frequency of aa is
a. Commensalist
0.09, then what is the frequency of AA?
b. Endoparasite
a. 0.21
c. Grazer
b. 0.42
d. Mutualist
c. 0.49
e. Predator
d. 0.84
e. None of the above
8. If a population of 100 in an environment
3. In a population at Hardy-Weinberg
equilibrium, if the allele frequency of B is
0.6, then what is the frequency of bb?
a. 0.05
b. 0.24
c. 0.36
d. 0.48
e. None of the above
4. Which of the following is the most
ancient era which lacks large fossils?
a. Cenozoic
b. Cretaceous
c. Mesozoic
d. Paleozoic
e. Precambrian
5. Which of the following is NOT an
assumption of the Hardy-Weinberg
theorem?
a. no genetic drift
b. no gene flow
c. no mutation
d. no natural selection
e. no random mating
with a carrying capacity of 200 is
undergoing logistic growth with a yearly
intrinsic rate of increase of 0.5, then what
is the size of the population after 1 year?
a. 105
b. 125
c. 150
d. 200
e. None of the above
9. Which of the following is a correct
species name?
a. Clostridium Botulinum
b. botulinum
c. Clostridium
d. Botulinum
e. None of the above
10. Which of the following increases
genetic variation in a population?
a. Genetic drift
b. Inbreeding
c. Mutation
d. Natural selection
e. None of the above (all decease variation)
MATCHING.For the following exercise match the word or phrase in the right column with the
corresponding organism in the left column. Each letter may be used more than once or not at all.
The number of blanks indicates the number of correct answers for each organism. (8%, 1% each)
1. Bacillus anthracis
A. Causes syphilis.
2. Escherichia coli
B. Cells are flagellated.
3. Streptococcus pyogenes
C. Cells are rod shaped.
4. Treponema pallida
D. Cells are spherically shaped.
5. Vibrio cholerae
E. Results in a systemic blood infection.
F. Form resistant endospores.
FILL-IN-THE-BLANK.For the following exercises write the appropriate word or words in the
available space, sketch, or label as appropriate. (24%)
1. Fill in the appropriate labels for the
following drawing. (6%)
3. Examine the phylogenetic tree below to
answer the following questions. (4%)
A
A (the dark black line)
A
B
C
D
E
B
C
a.
a. Circle three (3) monophyletic groups on
the phylogenetic tree above.
b.
c.
b. To which species is species C most
closely related.
2. Fill in the blanks below. (6%)
The three DOMAINS of life are…
,
4. Identify two things that are "wrong" or
misleading about this illustration. (4%)
,
and
.
3. What shape term best describes each
bacterium below. (2%)
a.
b.
Name
BIOLOGY 262, FALL 2001
EXAMINATION #2 (PART 2)
Date
DEFINITIONS.For the following BIOLOGICAL words or phrases define them as accurately and
concisely as possible. (20%, 4% each)
1. Bottleneck effect:
2. Ecological efficiency:
3. Evolutionary species concept:
4. Monophyletic group:
5. Negative control group:
SHORT ANSWER. Address each question in as concise and lucid a manner as possible. (10%)
1. Explain how and why a Phylogenetic Systematist and an Evolutionary Systematist classify
land vertebrates (amphibians, mammals, turtles, lizards & snakes, crocodilians, and birds)
differently. (6%) (Feel free but do not feel obliged to use illustrations in your answer.)
2. Genes for sacrificing oneself "for the good of the species," as illustrated by the lemmings
lacking inner tubes in the cartoon below, would not persist due to natural selection. Why?
(4%)
LONG ANSWERS.For the following, address each in as concise and lucid a manner as possible.
Do NOT exceed the space provided. (20%)
1. A small flock of five English house sparrows reaches an oceanic island. At the end of 10
years the island supports a stable population of about 10,000 individuals. (The population
size is still about 10,000 after 15 years.) When compared to the sparrows found on the
mainland, on average, the male island sparrows have darker plumage. (15%)
a.) Sketch a simple graph that shows the probable change in population size (N) from the
time of colonization to 15 years.
b.) Describe one evolutionary mechanism by which the island males could have developed
darker plumage. (Specifically relate this mechanism to the sparrow example.)
c.) Describe an alternative evolutionary mechanism which could explain the evolutionary
change in male plumage. (Specifically relate this mechanism to the sparrow example.)
2. Explain how antibiotic resistance arises and "spreads" in a population of bacteria. (5%)