Which Statement Regarding the Control of Glycogen Metabolism by Cyclic

Multiple Choice

Which statement regarding the control of glycogen metabolism by cyclic AMP is TRUE?

A) Cyclic AMP binds allosterically to both glycogen phosphorylase and glycogen synthase, activating the former and inactivating the latter.
B) Cyclic AMP stimulates the phosphorylation of glycogen phosphorylase and glycogen synthase, activating both.
C) Cyclic AMP stimulates the phosphorylation of glycogen phosphorylase and the dephosphorylation of glycogen synthase, activating the former and deactivating the latter.
D) Cyclic AMP stimulates the phosphorylation of both glycogen phosphorylase and glycogen synthase, activating the former and deactivating the latter.
E) Cyclic AMP increases the intracellular concentration of calcium ions which stimulates the dephosphorylation of both glycogen phosphorylase and glycogen synthase.