USABO UPDATED ACTUAL EXAM QUESTIONS
AND CORRECT ANSWERS FULL SOLUTION
GRADED A+
◉ What enzyme does HIV use to convert RNA to DNA? Answer:
Reverse Transcriptase
◉ The promoter region of a prokaryotic gene is located ______ to the
gene and is the binding site for ______. Answer: 5'...RNA polymerase
◉ Which of the following is TRUE of prokaryotes?
I. Simultaneous transcription and translation
II. Presence of intron sequences
III. Circular DNA Answer: I and III only
◉ 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? Answer:
Tryptophan
◉ When the base composition of DNA from bacterium
Mycobacterium tuberculosis was determined, 18% of the bases were
found to be adenine. What is the G + C content in M. tuberculosis?
Answer: 64%
,◉ 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? Answer: 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? Answer: schwann cell
◉ The cell bodies of afferent (sensory) nerves involved in somatic
reflexes are located in the Answer: Dorsal root ganglion
◉ Rods and cones are associated with _____ and _____ vision,
respectively. Answer: Light/dark...color
◉ Populations that are likely to be living at a density near the limit of
their resources, are characterized as Answer: K-selected
◉ In many types of cancer, the function of the p53 gene is lost. Wild-
type p53 is MOST likely to be a Answer: tumor suppressor
◉ What glycolytic product is shuttled to the mitochondria in aerobic
respiration? Answer: Pyruvate
◉ During human development, which process leads to the formation
of three germ layers? Answer: gastrulation
, ◉ Telomerase is responsible for _____ the size of telomeres, and its
function is often ____ in carcinogenesis. Answer: maintaining ...
increased
◉ Which of the following is NOT a mode of natural selection?
Answer: sexual selection
◉ Protostomes have _____ and _____ types of cleavage. Answer:
spiral ... determinate
◉ Which of the following is NOT a characteristic of all chordates?
Answer: vertebrae
◉ In cardiac muscle, calcium ions can move freely between adjacent
cells through which of the following? Answer: gap junctions
◉ Unlike most polypeptide hormones, steroid hormones are unique in
that they Answer: Diffuse across cell membranes
◉ In superoxide dismutase 1, an enzyme implicated in amyotrophic
lateral sclerosis (Lou Gehrig's disease), a copper ion is bound to the
active site and is important for enzyme activity. In this enzyme,
copper most likely functions as a(n) Answer: cofactor
AND CORRECT ANSWERS FULL SOLUTION
GRADED A+
◉ What enzyme does HIV use to convert RNA to DNA? Answer:
Reverse Transcriptase
◉ The promoter region of a prokaryotic gene is located ______ to the
gene and is the binding site for ______. Answer: 5'...RNA polymerase
◉ Which of the following is TRUE of prokaryotes?
I. Simultaneous transcription and translation
II. Presence of intron sequences
III. Circular DNA Answer: I and III only
◉ 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? Answer:
Tryptophan
◉ When the base composition of DNA from bacterium
Mycobacterium tuberculosis was determined, 18% of the bases were
found to be adenine. What is the G + C content in M. tuberculosis?
Answer: 64%
,◉ 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? Answer: 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? Answer: schwann cell
◉ The cell bodies of afferent (sensory) nerves involved in somatic
reflexes are located in the Answer: Dorsal root ganglion
◉ Rods and cones are associated with _____ and _____ vision,
respectively. Answer: Light/dark...color
◉ Populations that are likely to be living at a density near the limit of
their resources, are characterized as Answer: K-selected
◉ In many types of cancer, the function of the p53 gene is lost. Wild-
type p53 is MOST likely to be a Answer: tumor suppressor
◉ What glycolytic product is shuttled to the mitochondria in aerobic
respiration? Answer: Pyruvate
◉ During human development, which process leads to the formation
of three germ layers? Answer: gastrulation
, ◉ Telomerase is responsible for _____ the size of telomeres, and its
function is often ____ in carcinogenesis. Answer: maintaining ...
increased
◉ Which of the following is NOT a mode of natural selection?
Answer: sexual selection
◉ Protostomes have _____ and _____ types of cleavage. Answer:
spiral ... determinate
◉ Which of the following is NOT a characteristic of all chordates?
Answer: vertebrae
◉ In cardiac muscle, calcium ions can move freely between adjacent
cells through which of the following? Answer: gap junctions
◉ Unlike most polypeptide hormones, steroid hormones are unique in
that they Answer: Diffuse across cell membranes
◉ In superoxide dismutase 1, an enzyme implicated in amyotrophic
lateral sclerosis (Lou Gehrig's disease), a copper ion is bound to the
active site and is important for enzyme activity. In this enzyme,
copper most likely functions as a(n) Answer: cofactor
