17) the following happens whan a G-protein - coupled receptor activates a g prot

ID: 40083 • Letter: 1

Question

17) the following happens whan a G-protein - coupled receptor activates a g protein

a) the beta subunit exchanges GDP to GTP

b) it activates the alpha subunit and inactivates the beta gamma complex

c) the GDP bound to the alpha subunit is phosphorylated to form bound GDP

d) the alpha subunit exchanges it boudn GDP to GTP

18) nitric oxide (NO) stimulates the intracellular enzyme guanylyl cyclase by:

a) activating an intracellular protein kinase

b) diffusing into cells and stimulating the cyclase directly

c) activating a G protein

d) activating a receptor tyrosine kinase

19) calmodulin regulates the intracellular Ca2+ concentration.

True or False

17) c) the GDP bound to the alpha subunit is phosphorylated to form bound GDP

18) b) diffusing into cells and stimulating the cyclase directly

19) True

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