Cellular Responses to Hormones That Initiate Second-Messenger Systems Include ________

Multiple Choice

Cellular responses to hormones that initiate second-messenger systems include ________.

A) possible activation of several different second-messenger systems
B) cyclic AMP phosphodiesterase formation of an active second messenger
C) formation of a specific protein kinase that acts on a series of extracellular intermediates
D) hormone binding to intracellular receptors