Protostomes develop through
A. polar cleavage.
B. protocleavage.
C. spiral cleavage.
D. radial cleavage.
E. axial cleavage.
Answer: C
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Which molecule is directly responsible for breaking down cAMP to inactive AMP?
A. protein kinase A B. adenylyl cyclase C. phosphodiesterase D. GTPase E. protein phosphatase
The interstitial fluid is
a. involved in oxygen transport to tissue capillaries. b. the extracellular fluid. c. supplied by the blood. d. similar to protein-free plasma in composition. e. all of these.
Which of the following provides an example of epistasis?
A) Recessive genotypes for each of two genes (aabb) results in an albino corn snake. B) In rabbits and many other mammals, one genotype (ee) prevents any fur color from developing. C) In Drosophila (fruit flies), white eyes can be due to an X-linked gene or to a combination of other genes. D) In cacti, there are several genes for the type of spines.
Most human embryos that are aneuploid
A. are usually the result of increased nondisjunction in the gametes of older men. B. can develop and survive to adulthood. C. result in sterility. D. are spontaneously aborted in the first trimester. E. result in Down's syndrome.