Multiple Choice
Some hormones can not enter a cell directly because they are too large or polar.From the list select the molecule that acts as a secondary messenger for some of these hormones that can not enter a cell directly.
A) catecholamine
B) cyclic AMP
C) epinephrine
D) norepinephrine
E) calcitonin
Correct Answer:

Verified
Correct Answer:
Verified
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