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Final

Biology 1001A Study Guide - Final Guide: Warfarin, Falsifiability, Scantron CorporationExam


Department
Biology
Course Code
BIOL 1001A
Professor
Denis Maxwell
Study Guide
Final

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November 2016 Biology 1001A Term Test Part A: Individual Page 1 of 11
Code 111 Code 111 Code 111 80 minutes
Circle the best single letter choice for each of the following questions before transferring
your answers to your Scantron sheet. Note, for “multiple-multiple” style questions, more than
one option may be correct (e.g. 1, 2 & 3 only). Part marks may be available for choosing some
of the correct answers but choosing any incorrect answer earns a grade of “0”.
1. Which of the following statements is falsifiable?
1. All life on Earth uses the same genetic code.
2. Multicellular organisms first evolved about two million years ago.
3. All cell-based life stores its genetic information in the form of DNA.
4. Earth is not the only planet capable of supporting life.
A. 1, 2 & 3 only
B. 1 & 3 only
C. 2 & 4 only
D. 4 only
E. All of 1, 2, 3 and 4 are falsifiable.
2. Two populations of mice, which we will call 1 and 2, live on two different islands that are not
connected by gene flow. Population 1 is exposed to the pesticide Warfarin, which reduces the
survival and reproduction of individual mice without Warfarin-resistant mutations. Population 2
is not exposed to Warfarin.
Which of the following predictions about the evolution of Warfarin-resistance in these two
populations is correct?
1. Mutations improving Warfarin-resistance are equally likely to occur in either population.
2. Mutations improving Warfarin-resistance are equally advantageous in either population.
3. Warfarin-resistance will increase in Population 1.
4. Warfarin-resistance will increase in Population 2.
A. 1, 2 & 3 only
B. 1 & 3 only
C. 2 & 4 only
D. 4 only
E. All of 1, 2, 3 and 4 are correct.
3. The “C Value Enigma” has perplexed genome scientists for decades.
Which of the following questions best summarizes this enigma?
A. Why do most prokaryotes have higher C values than some eukaryotes?
B. Why do some cells of a given organism have 1C of DNA while other cells have 2C or even 4C?
C. Why do some species have dramatically different C values than related species?
D. Why is the C value of a species not related to the number of chromosomes in its karyotype?
Numbers at left show the proportion of the class choosing the correct answer.
0.35
0.9
0.52

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November 2016 Biology 1001A Term Test Part A: Individual Page 2 of 11
Code 111 Code 111 Code 111 80 minutes
4. If we pretend for the sake of this question that chromosomes remain condensed throughout
the cell cycle, which of the diagrams below depicts a diploid cell?
A. 1, 2 & 3 only
B. 1 & 3 only
C. 2 & 4 only
D. 4 only
E. All of 1, 2, 3 & 4 are correct.
5. Anaphase is the iconic stage of cell division; which of the following statements about this
anaphase cell is correct?
1. It could be in Meiosis II of an organism with 2n=8.
2. Non-kinetochore microtubules are pulling on one another.
3. There are 16 telomeres present.
4. It could be in Mitosis of an organism with 2n=8.
A. 1, 2 & 3 only
B. 1 & 3 only
C. 2 & 4 only
D. 4 only
E. All of 1, 2, 3 & 4 are correct.
6. Why were mobile elements included in the course under the topic of genetic variation?
A. Because mobile elements are very diverse in structure.
B. Because insertion of mobile elements creates mutations.
C. Because some mobile elements employ reverse transcriptase while others do not.
D. Because mobile elements are present in both eukaryotic and prokaryotic genomes.
2.
3.
4.
0.81
0.44
0.92

Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

November 2016 Biology 1001A Term Test Part A: Individual Page 3 of 11
Code 111 Code 111 Code 111 80 minutes
7. The image below shows a simplified sketch of three replication bubbles.
Which of the following statements about this figure is correct?
1. In total, the figure shows the action of twelve replication forks.
2. Whichever strand is the leading strand template for the leftmost bubble will also be the
leading strand template for the other two bubbles.
3. This could be a section of chloroplast DNA.
4. In any given bubble, DNA is being replicated semi-conservatively, bi-directionally and
semi-discontinuously.
A. 1, 2 & 3 only
B. 1 & 3 only
C. 2 & 4 only
D. 4 only
E. All of 1, 2, 3 & 4 are correct.
8. Descriptions of DNA replication usually emphasize how few mistakes are made. That is, DNA
replication is usually identified as a mechanism to ensure the inheritance of sameness.
However, what if we instead think of DNA replication as a mechanism of the inheritance of
difference?
By which of the following mechanisms does DNA replication introduce variation into the
coding region of a genome?
A. Failure of topoisomerase to unwind helix.
B. Failure of DNA polymerase III to proof-read.
C. Failure of telomerase to extend chromosome ends.
D. Failure of ligase to “seal” nicks in the sugar phosphate backbone.
9. For obvious reasons, plants have robust mechanisms to repair DNA damage caused by
exposure to sunlight, particularly the thymine dimers induced by UV radiation.
If a plant is exposed to UV light and then kept in the dark for several hours, thymine dimers
are repaired.
Which of the following mechanisms is most likely responsible for such “dark repair”?
A. Photolyase
B. Proofreading
C. Excision repair
D. Non-homologous end joining
0.51
0.9
0.45
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