The most abundant organic molecule in nature is:

A. water.
B. cellulose.
C. aquaporin.
D. cholesterol.
E. ATP.


Answer Key: B

Biology & Microbiology

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Sertoli cells stimulate sperm production in response to:

A. testosterone and FSH. B. testosterone and LH. C. FSH and LH. D. GnRH and LH E. testosterone.

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If a woman is positive for a recessive X-linked trait, she must have inherited it from which of her parents?

a. both parents b. her mother c. her father d. neither parents

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This animal has the fewest genes, the simplest

body plan, and only four cell types. It is a

a. planarian. b. placozoan. c. annelid. d. roundworm. e. sponge

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Earthworms have a(n)

A) exoskeleton. B) endoskeleton. C) hydrostatic skeleton.

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