USABO Practice (questions n
answers) rated A+
Reverse Transcriptase - ANS ✔What enzyme does HIV use to convert RNA to DNA?
5'...RNA polymerase - ANS ✔The promoter region of a prokaryotic gene is located ______ to the
gene and is the binding site for ______.
I and III only - ANS ✔Which of the following is TRUE of prokaryotes?
I. Simultaneous transcription and translation
II. Presence of intron sequences
III. Circular DNA
Tryptophan - ANS ✔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?
64% - ANS ✔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?
50% - ANS ✔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?
schwann cell - ANS ✔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?
,Dorsal root ganglion - ANS ✔The cell bodies of afferent (sensory) nerves involved in somatic
reflexes are located in the
Light/dark...color - ANS ✔Rods and cones are associated with _____ and _____ vision,
respectively.
K-selected - ANS ✔Populations that are likely to be living at a density near the limit of their
resources, are characterized as
tumor suppressor - ANS ✔In many types of cancer, the function of the p53 gene is lost. Wild-
type p53 is MOST likely to be a
Pyruvate - ANS ✔What glycolytic product is shuttled to the mitochondria in aerobic respiration?
gastrulation - ANS ✔During human development, which process leads to the formation of three
germ layers?
maintaining ... increased - ANS ✔Telomerase is responsible for _____ the size of telomeres, and
its function is often ____ in carcinogenesis.
sexual selection - ANS ✔Which of the following is NOT a mode of natural selection?
spiral ... determinate - ANS ✔Protostomes have _____ and _____ types of cleavage.
vertebrae - ANS ✔Which of the following is NOT a characteristic of all chordates?
, gap junctions - ANS ✔In cardiac muscle, calcium ions can move freely between adjacent cells
through which of the following?
Diffuse across cell membranes - ANS ✔Unlike most polypeptide hormones, steroid hormones
are unique in that they
cofactor - ANS ✔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)
right atrium, right ventricle, lungs, left atrium, left ventricle, body - ANS ✔The order of normal
blood flow through the human heart is
geographic - ANS ✔Allopatric speciation refers to species formed after which type of separation:
Carboxyl and amine - ANS ✔Which two functional groups are always found in amino acids?
Facilitated diffusion - ANS ✔Movement of ions across the membrane from higher to lower
concentrations through a channel protein is an example of
II - ANS ✔Which group of plants has vascular tissue but does not produce seeds?
I. Mosses
II. Ferns
III. Gymnosperms
Movement through xylem depends mainly on transpiration - ANS ✔Which of the following is
true for transport in xylem?
answers) rated A+
Reverse Transcriptase - ANS ✔What enzyme does HIV use to convert RNA to DNA?
5'...RNA polymerase - ANS ✔The promoter region of a prokaryotic gene is located ______ to the
gene and is the binding site for ______.
I and III only - ANS ✔Which of the following is TRUE of prokaryotes?
I. Simultaneous transcription and translation
II. Presence of intron sequences
III. Circular DNA
Tryptophan - ANS ✔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?
64% - ANS ✔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?
50% - ANS ✔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?
schwann cell - ANS ✔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?
,Dorsal root ganglion - ANS ✔The cell bodies of afferent (sensory) nerves involved in somatic
reflexes are located in the
Light/dark...color - ANS ✔Rods and cones are associated with _____ and _____ vision,
respectively.
K-selected - ANS ✔Populations that are likely to be living at a density near the limit of their
resources, are characterized as
tumor suppressor - ANS ✔In many types of cancer, the function of the p53 gene is lost. Wild-
type p53 is MOST likely to be a
Pyruvate - ANS ✔What glycolytic product is shuttled to the mitochondria in aerobic respiration?
gastrulation - ANS ✔During human development, which process leads to the formation of three
germ layers?
maintaining ... increased - ANS ✔Telomerase is responsible for _____ the size of telomeres, and
its function is often ____ in carcinogenesis.
sexual selection - ANS ✔Which of the following is NOT a mode of natural selection?
spiral ... determinate - ANS ✔Protostomes have _____ and _____ types of cleavage.
vertebrae - ANS ✔Which of the following is NOT a characteristic of all chordates?
, gap junctions - ANS ✔In cardiac muscle, calcium ions can move freely between adjacent cells
through which of the following?
Diffuse across cell membranes - ANS ✔Unlike most polypeptide hormones, steroid hormones
are unique in that they
cofactor - ANS ✔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)
right atrium, right ventricle, lungs, left atrium, left ventricle, body - ANS ✔The order of normal
blood flow through the human heart is
geographic - ANS ✔Allopatric speciation refers to species formed after which type of separation:
Carboxyl and amine - ANS ✔Which two functional groups are always found in amino acids?
Facilitated diffusion - ANS ✔Movement of ions across the membrane from higher to lower
concentrations through a channel protein is an example of
II - ANS ✔Which group of plants has vascular tissue but does not produce seeds?
I. Mosses
II. Ferns
III. Gymnosperms
Movement through xylem depends mainly on transpiration - ANS ✔Which of the following is
true for transport in xylem?
