Download B 262, S 2009

BIOLOGY 262, SUMMER 2009
EXAMINATION #3 (PART 1)
Date
Name
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. A population of 200 frogs is undergoing
1. Which of the following IS an assumption
logistic pop. growth with an intrinsic rate
of scientific philosophy?
a. Different events must be caused
of increase of 0.10 and a carrying capacity
uniquely.
of 2000. What is the pop. size after 1
b. Hypotheses can be proven True.
year?
c. Sense experience represents reality with
a.
2
f. 202
some reasonable consistency.
b. 10
g. 210
d. The universe is chaotic (unordered).
c. 18
h. 218
e. None of the above. (None are assumptions of
d.
20
i. 220
scientific philosophy)
e. 200
j. None of the above.
2. Which of the following is the Phylum to
7. For a population of 300 sparrows AT
which the model organism Arabidopsis
Hardy-Weinberg equilibrium with 48
thaliana (mouse-ear cress) belongs?
individuals with the AA genotype, how
a. Anthophyta
b. Bryophyta
many individuals are Aa?
c. Coniferophyta
a.
8
f. 120
d. Lycophyta
f. 10
g. 144
e. None of the above
g. 40
h. 180
h. 48
i. 192
3. Which of the following is the taxonomic
i.
60
j. None of the above.
rank between Class & Family?
a.
b.
c.
d.
e.
Genus
Kingdom
Order
Phylum
Species
4. Which of the following is when a
bacterium takes in DNA (as a plasmid)
directly from the environment?
a.
b.
c.
d.
e.
binary fission
conjugation
transcription
transformation
None of the above
5. Which of the following is likely the
reason why in the absence of antibiotics
populations of bacteria usually evolve to
become susceptible to antibiotics?
a. bacteria adopt and release resistance
plasmids in response to antibiotics
b. bacteria choose to lose resistance when
no longer needed
c. genetic drift causes it to happen
d. resistance mutations usually carry
reproductive costs
8. Given the following genotypes in a
population: 72 AA, 336 Aa, 392 aa. Is
this population evolving with respect to
the “A” gene?
a. No
b. Yes
c. Cannot determine with the info. given.
9. Which of the following is TRUE about
Coniferophyte gametophytes?
a. They are the dominant generation.
b. They make gametes by meiosis.
c. They make spores by mitosis.
d. They do not undergo photosynthesis.
e. None of the above (All are false.)
10. Determine the status of the hypothesis
that plant species richness will be
greater in shade using these data:
Mean species richness in shade = 22.4
Mean species richness in sun = 20.9
P-value = 0.08
a. Hypothesis Supported
b. Hypothesis Rejected
c. Cannot determine with the info. given.
FILL-IN-THE-BLANK/SHORT PROBLEM.⎯For the following exercises write the appropriate word or
words in the available space, sketch, or label as appropriate. (10%)
2. In the space below sketch and label a
1. In the space below sketch and label a
“typical” eukaryotic cell. Be certain to label
“typical” prokaryotic cell. Be certain to
at least five things. (5%)
label at least five things. (5%)
DEFINITIONS.⎯For the following BIOLOGICAL words or phrases define them as accurately and
concisely as possible. (20%, 4% each)
1. Edge Effect:
2. Gametophyte:
3. Genetic Drift:
4. Natural Selection:
5. Pollen:
Name
BIOLOGY 262, SUMMER 2009 - EXAMINATION #3 (PART 2)
Date
FREE RESPONSE QUESTIONS/PROBLEMS.⎯For the following, address each in as concise and lucid a
manner as possible. Do NOT exceed the space provided. (50%)
1. Fill in the data in the table (the outgroup, liverworts, has been completed for you), then use the data in
the table to construct a phylogenetic tree of the phyla in the left column. Show the derived
traits/synapomorphies on your phylogenetic tree. (10%)
Which life cycle
generation
dominant?
Seeds present
or absent?
Heterosporous
or
homosporous?
Apical growth
present or
absent?
Anthophyta
present
Coniferophyta
present
Pterophyta
present
Bryophyta
present
Liverworts OG
gametophyte
seeds absent
homosporous
absent
Vascular tissue
present or
absent?
vasc. tissue absent
2. Describe/explain the life cycle of a member of Phylum Pterophyta. Include all life cycle stages,
relevant unique structures, and label their ploidy. Also indicate all cellular processes that occur.
Indicate the life cycle generation that is considered to be dominant. (20%) (Feel free but do not feel obliged
to use labeled illustrations for your answer.)
3. A single bacterium infects a small cut on Edna’s arm. One week later Edna’s wound is very suddenly
red, painful and clearly infected. Her physician identifies the bacterium as Staphylococcus aureus
and prescribes penicillin. The infection seems to go away and Edna stopped taking the penicillin
once it seems to be gone (long before the end of her prescription). The infection again returned a
little more than a week after she stopped the penicillin, so Edna took the penicillin again until it again
looked like it was gone. This time it took longer for the penicillin to control the infection. The
infection returned again and, this time the infection did not go away and was completely unaffected
by the penicillin.
a.) Describe briefly what you know about the shape, arrangement of the cells, and cell wall
structure of Staphylococcus aureus. (3%)
b.) Provide a plausible evolutionary explanation for why the penicillin eventually did not stop
the Staphylococcus aureus infection. Explain what happened as Edna took and stopped
taking the penicillin that would result in her Staphylococcus aureus infection eventually
becoming unaffected by penicillin. (7%)
4. Generally explain the carbon cycle and how it is related to global climate change. (Feel free
but do not feel obliged to use a labeled diagram for your answer.) (10%)