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USABO 2024 OPEN EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS

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USABO 2024 OPEN EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS Which of the following would be most effective for sequencing the exact 5'- end of an mRNA transcript? PCR A. Primer extension B. Cloning C. Southern blot D. Linkage mapping - Answer-D. Southern blot A tissue type that consists ...

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  • October 21, 2024
  • 11
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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USABO 2024 OPEN EXAM QUESTIONS
WITH CORRECT DETAILED
ANSWERS

Which of the following would be most effective for sequencing the exact 5'- end of an
mRNA transcript?
PCR
A. Primer extension
B. Cloning
C. Southern blot
D. Linkage mapping - Answer-D. Southern blot

A tissue type that consists of protein fiber secreting cells scattered throughout the
extracellular matrix is common in:

A. cardiac muscle.
B. dendritic extensions.
C. skin surface.
D. lining of the pulmonary air sacs (alveoli).
E. tendons. - Answer-E. tendons.

Which of the following statements about the energy yield of aerobic respiration is NOT
true?

A. Less than 50% of the chemical energy stored in glucose is converted to ATP.
B. Glycolysis and pyruvate oxidation together provide more NADH per glucose molecule
than does the Krebs cycle.
C. Each pair of electrons donated by an FADH2 or NADH molecule during electron
transport results in the synthesis of more than one molecule of ATP.
D. ATP is needed to transport NADH produced during glycolysis into the mitochondria.
E. Most of the ATP derived during aerobic respiration results from the utilization of an
electrochemical gradient. - Answer-B. Glycolysis and pyruvate oxidation together
provide more NADH per glucose molecule than does the Krebs cycle.

Which of the following represents the correct sequence for protein digestion in humans?

A. Aminopeptidase, carboxypeptidase, chymotrypsin, pepsin
B. Aminopeptidase, pepsin, chymotrypsin, carboxypeptidase
C. Pepsin, carboxypeptidase, aminopeptidase, chymotrypsin
D. Chemotrypsin, aminopeptidase, carboxypeptidase, pepsin
E. Pepsin, chymotrypsin, carboxypeptidase, aminopeptidase - Answer-E. Pepsin,
chymotrypsin, carboxypeptidase, aminopeptidase

, A biologist collected seeds from 10 different plants, keeping all seeds under optimal
conditions of storage. Within a week after collection the seeds were germinated under
laboratory conditions. Each set of seeds was placed onto moist filter paper which was
remoistened as necessary and subjected to room temperature of 23˚C. Half the seeds
of each group received 24 hours of light, the other half were kept in darkness. Within
variable periods of time the seeds of certain plants kept in the light germinated. The
seeds of other plants kept in the dark germinated. Some sets of seeds germinated
under both light regimes. One set of seeds did not germinate under either light
condition. What might be a LOGICAL hypothesis, consistent with the data, for the lack
of germination of the one set of seeds?

A. The seeds required 12 hours of light and 12 hours of darkness in order to germinate.
B. All the seeds of that group were dea - Answer-D. The seeds required vernalization in
order to germinate.

Which of the following fibers binds to the cytoplasmic site of the cell-matrix adherens
junctions?

A. Elastin
B. Actin
C. Tubulin
D. Reticular
E. Collagen - Answer-B. Actin

Which of the following are NOT imbedded in the thylakoid membrane?

A. Enzymes associated with carbon dioxide fixation
B. Molecules of chlorophyll a and chlorophyll b
C. P700 and P680 molecules
D. Proton channels of the ATP synthase
E. Ferredoxin-NADP+ - Answer-A. Enzymes associated with carbon dioxide fixation

Of the following, which is the most significant explanation for the lack of a continuing
abiotic origin of life of Earth today?

A. There are no molten surfaces on which weak solutions of organic molecules could
polymerize.
B. All habitable places on Earth are already filled to capacity.
C. There is much less visible light reaching Earth now than when life first originated.
D. There is not enough lightening to provide an energy source.
E. The oxidizing atmosphere of today's Earth is not conducive to spontaneous formation
of complex molecules. - Answer-E. The oxidizing atmosphere of today's Earth is not
conducive to spontaneous formation of complex molecules.
One of the extraembryonic membranes/structures produces proteins that suppress the
maternal immune response against the fetus. This membrane/structure is the:

A. allantois.
B. chorion.
C. yolk sac.

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