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USABO Open Exam Questions and Answers
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USABO Open Exam Questions and Answers
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USABO Open Exam Questions andAnswers
What enzyme does HIV use to convert RNA to DNA?
[ ] A. DNA gyrase
[ ] B. RNA polymerase
[ ] C. Reverse transcriptase
[ ] D. DNA helicase - Answer -C
Which of the following is TRUE of prokaryotes?
I. Simultaneous transcription and translation
II. Presence of intron sequences
III. Circular DNA
[ ] A. I and II only
[ ] B. I and III only
[ ] C. II and III only
[ ] D. I, II, and III - Answer -B
The promoter region of a prokaryotic gene is located ______ to the gene and is the
binding site for ______.
[ ] A. 3'...DNA polymerase
[ ] B. 3'...RNA polymerase
[ ] C. 5'...DNA polymerase
[ ] D. 5'...RNA polymerase - Answer -D
. Integral transmembrane proteins are proteins imbedded in the cell membrane. Which
of the following amino acids would you MOST expect to find in the transmembrane
region of such proteins?
[ ] A. Lysine
[ ] B. Serine
[ ] C. Tryptophan
[ ] D. Arginine - Answer -C Tryptophan
(it is non polar and does not have a charge)
, The frequency of individuals affected with an autosomally recessive inherited disorder is
1 in 4. Assuming that the population affected by this disease is in Hardy-Weinberg
equilibrium, what is the proportion of carrier individuals in this population?
[ ] A. 12.5%
[ ] B. 25%
[ ] C. 50%
[ ] D. 100% - Answer -C 50%
The velocity of action potential conduction across a nerve axon is increased by the
presence of the myelin sheath. In the peripheral nervous system, what cell myelinates
the axon?
[ ] A. Oligodendocyte
[ ] B. Astrocyte
[ ] C. Schwann cell
[ ] D. Microglial cell - Answer -Schwann cell
Rods and cones are associated with _____ and _____ vision, respectively.
[ ] A. Light/dark...color
[ ] B. Color...light/dark
[ ] C. Near...far
[ ] D. Far...near - Answer -A
In many types of cancer, the function of the p53 gene is lost. Wild-type p53 is MOST
likely to be a
[ ] A. proto-oncogene
[ ] B. tumor suppressor
[ ] C. positive regulator of cell cycle progression
[ ] D. gene required for DNA replication - Answer -B
What glycolytic product is shuttled to the mitochondria in aerobic respiration?
[ ] A. Acetyl-CoA
[ ] B. Fumarate
[ ] C. Succinyl-CoA
[ ] D. Pyruvate - Answer -D
Telomerase is responsible for _____ the size of telomeres, and its function is often ____
in carcinogenesis.
[ ] A. maintaining ... decreased
[ ] B. maintaining ... increased
[ ] C. decreasing ... decreased
[ ] D. decreasing ... increased - Answer -B
Which of the following is NOT a mode of natural selection?
[ ] A. stabilizing selection
[ ] B. sexual selection
[ ] C. directional selection
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