Choose the incorrect statement. a.Muscarine binding to a G protein-coupled receptor results in the activation of the amplifier e
nzyme adenylate cyclase, and formation of CAMP b.Administration of epinephrine can lead to both the contraction and relaxation of smooth muscles, because epinephrine binds to both alpha and beta adrenergic receptors c.The binding of epinephrine to a B receptor may lead to the intracellular formation of the second messenger molecule cAMP c.Activation of Phospholipase C by the the a subunit of a G protein may lead to the formation of IP3.
Muscarine binding to a G protein-coupled receptor results in the activation of the amplifier enzyme adenylate cyclase, and formation of cAMP.
Explanation:
Because I thought the mechanism by which the muscarinic receptor inhibits adenylyl cyclase is through activation of an inhibitory GTP-binding protein, Gi. The α subunit of Gi competes with the α subunit of the G protein activated by stimulatory agonists (GS) for regulation of adenylyl cyclase.
