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USABO OPEN EXAM 2013 QUESTIONS AND ANSWERS

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USABO OPEN EXAM 2013 QUESTIONS AND ANSWERS

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  • September 21, 2024
  • 47
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • USABO
  • USABO
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42 Multiple choice questions

Term 1 of 42
Sam was walking through an alley when he spotted a small lump next to the dumpster. When
he examined the lump, he found that it was a newborn baby that was not breathing. He called
"911" to report the incident. When the police arrived, they questioned Sam regarding whether
the baby was alive when he found it. He said, "No." The baby was autopsied to determine if it
were alive or dead at birth. Which of the following results of the autopsy would prove that the
baby was born dead and not alive?

Discoloration of the lungs.

Dissected lung(s) floats in water.


Dissected lung(s) sinks in water.

Lungs collapsed.

Lungs inflated with fluid

Term 2 of 42
Which of the following is a way in which the cell increases gene expression in the nucleus?

Acetylation of histone tails


DNA methylation


Locating a gene within heterochromatin

Dephosphorylating DNA


Alternative splicing

,Term 3 of 42
Many important foods are fruits. Which of the following is not a fruit or part of a fruit?

Corn


Jalapeño

Rhubarb


Squash

Tomato

Term 4 of 42
A mother antelope and its child are galloping along the plains, when they encounter a group
of hungry lions. If the two antelopes try to escape the lions together, there is a 75% chance that
both will be consumed and eaten, and a 25% chance that both will escape alive. If, however,
the mother sacrifices herself to the lions, she may be able to buy her baby additional time to
escape. What is the minimum chance that the baby can have to escape from the lions following
such a sacrifice such that the mother's action will be evolutionarily favored? You may assume
that the baby antelope, once escaped, will be guaranteed to survive into a reproducing adult,
and that the mother antelope is at the beginning of reproductive age.

25%

33%

50%


66%

75%

,Term 5 of 42
Which of the following is not formed from neural crest cells?

Peripheral nerves


Bones of the middle ear

Parts of teeth

Bones of the jaw

Muscles of the face

Term 6 of 42
Which gland is directly controlled by messages from nerves leading into it?

Adrenal cortex

Adrenal medulla

Anterior pituitary


Testes

Ovaries

Term 7 of 42
Olney, IL, is known for its white squirrel population. In this squirrel population, assume that 10%
of the genes are for albino coat color and 90% are for gray coat. If HardyWeinberg
assumptions are true, what percentage of the squirrels are heterozygous?

90

81


18

9

1

, Term 8 of 42
Lettuce seeds receive flashes of far red and red light in this order: far red, red, far red, red, red,
red, red, far red. The seeds will

Germinate since far red light induces germination.

Germinate since the first flash of light determines germination.

Germinate since there are more flashes of red light.

Not germinate since the flashes of light have destroyed the seeds.


Not germinate since only the last flash of light determines germination.

Term 9 of 42
Place the following statements regarding photosynthesis in C4 plants in the correct order:
I. ATP is used to convert pyruvate to phosphoenolpyruvate (PEP).
II. Mesophyll cells export four-carbon products such as malate through plasmodesmata to the
bundle-sheath cells.
III. PEP carboxylase adds CO2 to PEP to produce oxaloacetate.
IV. CO2 is used to produce G3P in the Calvin cycle.
V. CO2 is released in cells that contain the protein rubisco, which binds it.

II, V, IV, I, III

V, II, III, IV, I

I, III, V, II, IV

I, III, II, V, IV


I, V, III, II, IV

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