USABO Practice exam with
comprehensive questions and well
elaborated correct answers GRADED
A+
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What enzyme does HIV use to convert RNA to DNA? - correct ans:Reverse Transcriptase
,The promoter region of a prokaryotic gene is located ______ to the gene and is the binding site for
______. - correct ans:5'...RNA polymerase
Which of the following is TRUE of prokaryotes?
I. Simultaneous transcription and translation
II. Presence of intron sequences
III. Circular DNA - correct ans: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? - correct
ans: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? - correct ans: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? - correct ans: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? - correct ans:schwann
cell
The cell bodies of afferent (sensory) nerves involved in somatic reflexes are located in the - correct
ans:Dorsal root ganglion
Rods and cones are associated with _____ and _____ vision, respectively. - correct ans:Light/dark...color
Populations that are likely to be living at a density near the limit of their resources, are characterized as -
correct ans:K-selected
, In many types of cancer, the function of the p53 gene is lost. Wild-type p53 is MOST likely to be a -
correct ans:tumor suppressor
What glycolytic product is shuttled to the mitochondria in aerobic respiration? - correct ans:Pyruvate
During human development, which process leads to the formation of three germ layers? - correct
ans:gastrulation
Telomerase is responsible for _____ the size of telomeres, and its function is often ____ in
carcinogenesis. - correct ans:maintaining ... increased
Which of the following is NOT a mode of natural selection? - correct ans:sexual selection
Protostomes have _____ and _____ types of cleavage. - correct ans:spiral ... determinate
Which of the following is NOT a characteristic of all chordates? - correct ans:vertebrae
In cardiac muscle, calcium ions can move freely between adjacent cells through which of the following? -
correct ans:gap junctions
Unlike most polypeptide hormones, steroid hormones are unique in that they - correct ans: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) - correct ans:cofactor
The order of normal blood flow through the human heart is - correct ans:right atrium, right ventricle,
lungs, left atrium, left ventricle, body
Allopatric speciation refers to species formed after which type of separation: - correct ans:geographic
comprehensive questions and well
elaborated correct answers GRADED
A+
Professional Academic Assistance Services
Services Offered
Proctored Exam Assistance
Online Class Management (Full Course Support)
Exam Preparation & Study Materials
Assignments and Coursework Support
Essays and Research Papers
Discussion Posts and Replies
What enzyme does HIV use to convert RNA to DNA? - correct ans:Reverse Transcriptase
,The promoter region of a prokaryotic gene is located ______ to the gene and is the binding site for
______. - correct ans:5'...RNA polymerase
Which of the following is TRUE of prokaryotes?
I. Simultaneous transcription and translation
II. Presence of intron sequences
III. Circular DNA - correct ans: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? - correct
ans: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? - correct ans: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? - correct ans: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? - correct ans:schwann
cell
The cell bodies of afferent (sensory) nerves involved in somatic reflexes are located in the - correct
ans:Dorsal root ganglion
Rods and cones are associated with _____ and _____ vision, respectively. - correct ans:Light/dark...color
Populations that are likely to be living at a density near the limit of their resources, are characterized as -
correct ans:K-selected
, In many types of cancer, the function of the p53 gene is lost. Wild-type p53 is MOST likely to be a -
correct ans:tumor suppressor
What glycolytic product is shuttled to the mitochondria in aerobic respiration? - correct ans:Pyruvate
During human development, which process leads to the formation of three germ layers? - correct
ans:gastrulation
Telomerase is responsible for _____ the size of telomeres, and its function is often ____ in
carcinogenesis. - correct ans:maintaining ... increased
Which of the following is NOT a mode of natural selection? - correct ans:sexual selection
Protostomes have _____ and _____ types of cleavage. - correct ans:spiral ... determinate
Which of the following is NOT a characteristic of all chordates? - correct ans:vertebrae
In cardiac muscle, calcium ions can move freely between adjacent cells through which of the following? -
correct ans:gap junctions
Unlike most polypeptide hormones, steroid hormones are unique in that they - correct ans: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) - correct ans:cofactor
The order of normal blood flow through the human heart is - correct ans:right atrium, right ventricle,
lungs, left atrium, left ventricle, body
Allopatric speciation refers to species formed after which type of separation: - correct ans:geographic
