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2003 USABO Open Exam WITH 100- CORRECT ANSWERS
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2003 USABO Open Exam WITH 100- CORRECT ANSWERS
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10/23/24, 3:11 MEUNICE
2003 USABO Open Exam WITH COMPLETE ANSWERS
What enzyme does HIV use to convert C
RNA to DNA?
[ ] A. DNA gyrase
[ ] B. RNA polymerase
[ ] C. Reverse transcriptase
[ ] D. DNA helicase
Which of the following is TRUE of B
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
The promoter region of a prokaryotic gene D
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
. Integral transmembrane proteins are C Tryptophan
proteins imbedded in the cell membrane. (it is non polar and does not have a charge)
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
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, 10/23/24, 3:11 M
The frequency of individuals affected with C 50%
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%
The velocity of action potential conduction Schwann cell
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
Rods and cones are associated with _____ A
and ___ vision, respectively.
[ ] A. Light/dark. color
[ ] B. Color light/dark
[ ] C. Near far
[ ] D. Far near
In many types of cancer, the function of the B
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
What glycolytic product is shuttled to the D
mitochondria in aerobic respiration?
[ ] A. Acetyl-CoA
[ ] B. Fumarate
[ ] C. Succinyl-CoA
[ ] D. Pyruvate
Telomerase is responsible for ____ the size B
of telomeres, and its function is often ___ in
carcinogenesis.
[ ] A. maintaining ..... decreased
[ ] B. maintaining ..... increased
[ ] C. decreasing .... decreased
[ ] D. decreasing ......increased
Which of the following is NOT a mode of B
natural selection?
[ ] A. stabilizing selection
[ ] B. sexual selection
[ ] C. directional selection
[ ] D. diversifying selection
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