It is now thought that ________ causes ________ synthesis, and this latter hormone is responsible for causing leaves to fall from trees.
A. auxin; ethylene
B. gibberellin; ethylene
C. cytokinin; gibberellin
D. auxin; cytokinin
Answer: A
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The cardiac, pyloric, anal, and ileocecal sphincters are all part of the
a. digestive tract. b. respiratory tract. c. circulatory system. d. muscular system.
Which hormone shuts down HCl secretion?
a. gastrin b. somatostatin c. leptin d. ghrelin e. secretin
An unpressurized autoclave would not be able to sterilize a growth medium with contaminating bacteria but could still pasteurize it
Indicate whether the statement is true or false.
Answer the following statements true (T) or false (F)
1. The same neurotransmitter may produce either excitatory or inhibitory effects on postsynaptic neurons depending on the specific receptor type it binds. 2. Gamma aminobutyric acid (GABA) is the most common inhibitory neurotransmitter in vertebrates. 3. Ionotropic receptors act by activating G proteins in target cells. 4. Metabotropic receptors act by initiating changes in second messenger systems in target cells.