28/12/2024, 20:29 USABO Open Exam |2025 UPDATE |ACTUAL EXAM QUESTIONS AND VERIFIED ANSWERS/ACCURATE SOLUTIONS | ALRE…
USABO Open Exam 2VERSIONS (VERSION A,B)
|2025 UPDATE |ACTUAL EXAM 300 QUESTIONS
AND VERIFIED ANSWERS/ACCURATE
SOLUTIONS | ALREADY GRADED A+| ASSURED
SUCCESS
Terms in this set (30)
What enzyme does HIV C
use to convert RNA to
DNA?
[ ] A. DNA gyrase
[ ] B. RNA polymerase
[ ] C. Reverse transcriptase
[ ] D. DNA helicase
Which of the following is B
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
https://quizlet.com/988614666/usabo-open-exam-2025-update-actual-exam-questions-and-verified-answersaccurate-solutions-already-graded-a-assu… 1/21
,28/12/2024, 20:29 USABO Open Exam |2025 UPDATE |ACTUAL EXAM QUESTIONS AND VERIFIED ANSWERS/ACCURATE SOLUTIONS | ALRE…
The promoter region of a D
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
. Integral transmembrane C Tryptophan
proteins are proteins (it is non polar and does not have a charge)
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
The frequency of C 50%
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%
https://quizlet.com/988614666/usabo-open-exam-2025-update-actual-exam-questions-and-verified-answersaccurate-solutions-already-graded-a-assu… 2/21
, 28/12/2024, 20:29 USABO Open Exam |2025 UPDATE |ACTUAL EXAM QUESTIONS AND VERIFIED ANSWERS/ACCURATE SOLUTIONS | ALRE…
The velocity of action Schwann cell
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
Rods and cones are A
associated with ___ and
___ vision, respectively.
[ ] A. Light/dark. color
[ ] B. Color .... light/dark
[ ] C. Near ... far
[ ] D. Far .. near
In many types of cancer, B
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
https://quizlet.com/988614666/usabo-open-exam-2025-update-actual-exam-questions-and-verified-answersaccurate-solutions-already-graded-a-assu… 3/21
USABO Open Exam 2VERSIONS (VERSION A,B)
|2025 UPDATE |ACTUAL EXAM 300 QUESTIONS
AND VERIFIED ANSWERS/ACCURATE
SOLUTIONS | ALREADY GRADED A+| ASSURED
SUCCESS
Terms in this set (30)
What enzyme does HIV C
use to convert RNA to
DNA?
[ ] A. DNA gyrase
[ ] B. RNA polymerase
[ ] C. Reverse transcriptase
[ ] D. DNA helicase
Which of the following is B
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
https://quizlet.com/988614666/usabo-open-exam-2025-update-actual-exam-questions-and-verified-answersaccurate-solutions-already-graded-a-assu… 1/21
,28/12/2024, 20:29 USABO Open Exam |2025 UPDATE |ACTUAL EXAM QUESTIONS AND VERIFIED ANSWERS/ACCURATE SOLUTIONS | ALRE…
The promoter region of a D
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
. Integral transmembrane C Tryptophan
proteins are proteins (it is non polar and does not have a charge)
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
The frequency of C 50%
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%
https://quizlet.com/988614666/usabo-open-exam-2025-update-actual-exam-questions-and-verified-answersaccurate-solutions-already-graded-a-assu… 2/21
, 28/12/2024, 20:29 USABO Open Exam |2025 UPDATE |ACTUAL EXAM QUESTIONS AND VERIFIED ANSWERS/ACCURATE SOLUTIONS | ALRE…
The velocity of action Schwann cell
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
Rods and cones are A
associated with ___ and
___ vision, respectively.
[ ] A. Light/dark. color
[ ] B. Color .... light/dark
[ ] C. Near ... far
[ ] D. Far .. near
In many types of cancer, B
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
https://quizlet.com/988614666/usabo-open-exam-2025-update-actual-exam-questions-and-verified-answersaccurate-solutions-already-graded-a-assu… 3/21
