Which of the following happens in the second-messenger step
A) A small amount of one hormone (the second messenger) is required to release another.
B) A tropic hormone (the first messenger) stimulates secretion of another hormone (the second messenger) .
C) The hormone first binds to a specific surface receptor, whereupon the hormone-receptor complex moves into the cell to combine with a specific intracellular receptor.
D) A hormone (the first messenger) binds to surface receptors, activating adenylyl cyclase, which catalyzes cAMP formation.
Correct Answer:
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