What is the principal substance that mediates phototropism in stems?
a. auxin
b. gibberellin
c. abscisic acid
d. ethylene
e. cytokinin
ANSWER: a
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Which of the photographs in the above figure
represents the angiosperms? a. moss b. fern c. conifer d. monocot e. all of these
Prescription drugs such as Prozac help maintain higher levels of serotonin in the brain. What effect will this have on an individual?
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An inhibitory postsynaptic potential occurs when __________.
Fill in the blank(s) with the appropriate word(s).