Cellular responses to hormones that initiate second- messenger systems include .
A)hormone binding to intracellular receptors
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)possible activation of several different second- messenger systems

Question

Quizplus · Accepted Answer

Hormones that initiate second-messenger systems can activate several different second-messenger systems, including cyclic AMP, inositol trisphosphate (IP3), and diacylglycerol (DAG) pathways. This allows for a diverse range of cellular responses to the hormone signal. Hormones that bind to intracellular receptors (Choice A) typically initiate slower, more sustained responses. Cyclic AMP phosphodiesterase (Choice B) is an enzyme that can break down cyclic AMP and terminate its signaling. Formation of a specific protein kinase (Choice C) that acts on extracellular intermediates is not a typical feature of second-messenger systems.

Cellular Responses to Hormones That Initiate Second- Messenger Systems Include