Which Statement Regarding the Control of Glycogen Metabolism by Cyclic

question 28

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.

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Definitions:

Past Consideration

A benefit already provided or an action already performed, which cannot legally constitute consideration for a current contract.

Consideration

A value that is exchanged between parties in a contract, making the agreement legally binding.

Promissory Estoppel

A legal principle that prevents a party from withdrawing a promise made to another party, if the latter has reasonably relied on that promise to their detriment.

Hamer v. Sidway

A landmark case in contract law regarding forbearance as consideration, where a promise not to do something can be as legally binding as a promise to do something.