MCAT Question A Day - 6/23/14 - Answer!
All of the following act as second messengers for hormones EXCEPT:
A. cyclic AMP
B. calmodulin
C. acetylcholine
D. cyclic GMP
C is correct. Acetylcholine acts through a second messenger system, and is not a second messenger itself.
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C is correct. Acetylcholine acts through a second messenger system, and is not a second messenger itself.
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