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MCAT Question A Day - 7/6/14 - Answer!

A drug that causes increasesecretion of testosterone from the interstitial cells of physically mature malwould most likely:

A.  cause the testes to descend prematurely.
B.  delay the onset of puberty.
C.  cause enhanced secondary sex characteristics.
D.  decrease core body temperature.

C is correct. A looks good (testosterone does stimulate the testes to descend) until you notice that we're dealing with a physically mature male. The testes nonnally descend during late fetal development. B is out because increased testosterone would cause puberty to occur early, and would not change the timing of puberty if it's already happened (we are, after all, dealing with a physically mature male). D is out because we don't know of any direct mechanism by which testosterone increases body temperature.