A Hormone Binds a Receptor and Activates the CAMP Signal

Multiple Choice

A hormone binds a receptor and activates the cAMP signal transduction pathway ultimately leading to the cell response. Which of the following is NOT a likely mechanism for reversing (or shutting off) cAMP transduction?

A) The hormone dissociating from the receptor.
B) The GTP on the alpha subunit of the G protein is hydrolyzed to GDP.
C) Activate phosphodiesterase.
D) Activate adenylyl cyclase.
E) Protein phosphatases remove phosphates from proteins initially activated by protein kinase A.