USABO Open Exam
In certain areas of Sub-Saharan Africa high levels of anemia are exhibited as a
consequence of iron deficiency. What other symptom would you expect might be found
in these peoples?
A. goiter
B. decrease in immune function
C. high degree of oscillation in blood glucose levels
D. scurvy
E. reproductive failure - ANS-B. decrease in immune function
Inflammation and injury of the pancreas can cause elevated levels of serum amylase.
Injury or disease of which of the following organs might you expect to produce a similar
laboratory finding?
A. Liver
B. Colon
C. Thyroid
D. Salivary gland
E. Adrenal gland - ANS-D. Salivary gland
What process in plants requires darkness?
A. the light-independent reactions
B. the light-dependent reactions
C. coordination of protein synthesis
D. coordination of hormone synthesis
E. both C and D - ANS-E. both C and D
The fluidity of a lipid bilayer is enhanced with:
A. decreased temperature.
B. increased unsaturation in fatty acid tails.
C. increased unsaturation in polar head groups.
D. increased saturation in fatty acid tails.
E. increased fatty acid chain length. - ANS-B. increased unsaturation in fatty acid tails.
, An inbred strain of plants has a mean height of 24 cm. A second strain of the same
species also has a mean height of 24 cm. When these plants are crossed, the F1 are
also 24 cm in height. However, when the F1 plants are crossed, the F2 plants show a
wide range of heights; the greatest number are similar to the P1 and F1, but
approximately 4 of 1000 are only 12 cm tall and 4 of 1000 are 40 cm tall. What fraction
of the F2 plants will be approximately 28 cm in height? [Assume that each of the alleles
involved in determining increase in plant height contributes the same amount.]
A. 314
B. 9/16
C. 56/256
D. None
E. Cannot be determined from the information given. - ANS-C. 56/256
The skin forming the flying surface in the wing of a bat and the feathers forming the
flying surface in the wing of a bird:
A. evolved from a similar structure in a common ancestor.
B. are different because of adaptive radiation.
C. do not develop from the same sources in the embryos of bat and bird, and are
analogous.
D. perform different functions in the bat and the bird.
E. evolved in response to "felt need" in adult birds and bats. - ANS-C. do not develop
from the same sources in the embryos of bat and bird, and are analogous.
Your parents built a tree house for you when you were 8 years old and 4 feet tall. They
placed the tree house on a branch of a tree that was 5 feet above the ground in a tree
that was 20 feet tall. You are now 17 years old and 6 feet tall. The tree has grown to be
50 feet tall. How high above the ground is the branch on which the tree house is resting
now?
A. 4 feet
B. 5 feet
C. 17 feet
D. 20 feet
E. 35 fee - ANS-B. 5 feet
When they encounter a predator, small fish form schools that look like balls, thereby:
A. avoiding the predator.
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