Which molecule is the main structural component of biological membranes?

a. starch
b. triglyceride
c. protein
d. phospholipid
e. steroid


ANSWER: d

Biology & Microbiology

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Insects are currently thought to have evolved from

a. myriapods. b. animals. c. algae. d. crustaceans. e. all of these.

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The undifferentiated genitalia of an early human embryo develops into male genitalia under the

influence of A. oxytocin. B. prostaglandin and DHT. C. prolactin. D. testosterone and DHT. E. Müllerian duct inhibitors.

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In Figure 43-3, the vestibular canal is labeled:a

1
b. 2
c. 3
d. 7
e. 8

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Pollen tubes

A. allow sperm to fertilize the egg. B. are present during spermatogenesis. C. facilitate the growth of pollen. D. transport pollen to the stigma. E. package sperm into pollen granules.

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