A myelin sheath functions to ____
a. protect axons
b. allow nerve cells to divide
c. trigger action potentials
d. increase electrical propagation speeds
e. promote neurotransmitter release
ANSWER: d
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A reaction is
(a) a reflex. (b) involuntary. (c) voluntary. (d) both a and b.
Which of the following is incorrect about turgor pressure?
A. It occurs in an organism with cell walls when placed into a hypertonic environment. B. It is necessary to keep plants from wilting. C. It is the force of water against the inside of the cell wall. D. It is maintained by osmosis. E. It occurs in an organism with cell walls when placed into a hypotonic environment.
In a hypersensitive response:a
long-lasting resistance is built up throughout the plant. b. the axillary buds break dormancy. c. cryptochrome is synthesized. d. jasmonic acid activates enzymes. e. the infected area is sealed off by necrotic lesions.
DES is called an "endocrine disrupting chemical" because it structurally resembles, and interferes with, the endocrine secretions of the _____
A) thyroid gland B) adrenal medulla C) ovaries D) hypothalamus