60. How do heterotrimeric G proteins activate adenylyl cyclase? a. The G protein

Question

60. How do heterotrimeric G proteins activate adenylyl cyclase? a. The G protein trimer attaches to adenylyl cyclase to activate it. b. The G protein mediates the release of cAMP-dependent protein kinase, whiclh activates adenylyl cyclase. C. The G protein activates various second messengers, which all activate pathways that activate adenylyl cyclase. d. The a subunit of the G protein bound to GTP, diffuses laterally in the membrane and binds to adenylyl cyclase to activate it. 61. Which of the following statements about glial cells is true? a. They increase the velocity of nerve-impulse propagation. b. They act as metabolic intermediaries between capillaries and neurons c. They mediate immune responses in neurons d. All of the above

Explanation / Answer

60) D: GPCRs work this way

61) D: The glial cells surround neurons and provide support for and insulation between them. Glial cells are the most abundant cell types in the central nervous system. Types of glial cells include oligodendrocytes, astrocytes, ependymal cells, Schwann cells, microglia, and satellite cells.

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