In muscle, the first event in the breakdown of glycogen due to binding of a hormone is _____.
A) cytoplasmic cAMP levels rise
B) protein kinase A phosphorylates phosphorylase kinase
C) adenylate cyclase is activated
D) protein kinase A is activated
E) activation of a G protein

Question

Quizplus · Accepted Answer

The first event in the breakdown of glycogen in muscle due to hormone binding is the activation of a G protein. This activation leads to a cascade of events, including the activation of adenylate cyclase, which increases cAMP levels, subsequently activating protein kinase A.

In Muscle, the First Event in the Breakdown of Glycogen