Choose the incorrect statement. a. Muscarine binding to a G protein-coupled receptor results in the activation of the amplifier enzyme 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.

I think!

c

explanation:

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."