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.
Biology & Microbiology
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.
Biology & Microbiology
In Figure 43-3, the vestibular canal is labeled:a
1
b. 2
c. 3
d. 7
e. 8
Biology & Microbiology
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.
Biology & Microbiology