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USABO QUESTIONS WITH ACCURATE ANSWERS
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USABO QUESTIONS WITH ACCURATE ANSWERSWhat enzyme does HIV use to convert RNA to DNA? Accurate Answer -
Reverse Transcriptase
The promoter region of a prokaryotic gene is located ______ to the gene and is
the binding site for ______. Accurate 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 Accurate 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? Accurate 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? Accurate 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? Accurate 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? Accurate Answer - schwann cell
The cell bodies of afferent (sensory) nerves involved in somatic reflexes are
located in the Accurate Answer - Dorsal root ganglion
Rods and cones are associated with _____ and _____ vision, respectively.
Accurate Answer - Light/dark...color
Populations that are likely to be living at a density near the limit of their
resources, are characterized as Accurate 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 Accurate Answer - tumor suppressor
What glycolytic product is shuttled to the mitochondria in aerobic
respiration? Accurate Answer - Pyruvate
During human development, which process leads to the formation of three
germ layers? Accurate Answer - gastrulation
Telomerase is responsible for _____ the size of telomeres, and its function is
often ____ in carcinogenesis. Accurate Answer - maintaining ...
increased
Which of the following is NOT a mode of natural selection? Accurate
Answer - sexual selection
Protostomes have _____ and _____ types of cleavage. Accurate Answer -
spiral ... determinate
Which of the following is NOT a characteristic of all chordates?
Accurate Answer - vertebrae
In cardiac muscle, calcium ions can move freely between adjacent cells
through which of the following? Accurate Answer - gap junctions
Unlike most polypeptide hormones, steroid hormones are unique in that they
Accurate 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) Accurate Answer - cofactor
The order of normal blood flow through the human heart is Accurate
Answer - right atrium, right ventricle, lungs, left atrium, left ventricle, body
Allopatric speciation refers to species formed after which type of separation:
Accurate Answer - geographic
, Which two functional groups are always found in amino acids?
Accurate Answer - Carboxyl and amine
Movement of ions across the membrane from higher to lower concentrations
through a channel protein is an example of Accurate Answer -
Facilitated diffusion
Which group of plants has vascular tissue but does not produce seeds?
I. Mosses
II. Ferns
III. Gymnosperms Accurate Answer - II
Which of the following is true for transport in xylem? Accurate Answer
- Movement through xylem depends mainly on transpiration
Predation is considered a _________ interaction, while Mutualism is considered
a ___________ interaction. Accurate Answer - +/-, +/+
Which of the following organisms is INCORRECTLY paired with its trophic
level? Accurate Answer - Beetle - secondary consumer
Which of the following is an example of habituation? Accurate Answer
- Hydra initially contract when gently touched, but soon stop responding.
Suppose gene "C" is the gene for color. Its dominant allele has the effect of
allowing the production of fur color while its recessive allele interrupts color
production. At another locus, there exists another gene that influences color,
at which black (B) is dominant to brown (b). What is the relationship between
these genes called? Accurate Answer - Epistatic
During migrations, some birds use which of the following as reference
frameworks?
I. The sun
II. Constellations
III. Earth's magnetic field Accurate Answer - I,II, and III
Generally, there are more species per square kilometer in which of the
following types of ecosystem? Accurate Answer - Coral reef
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