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Sutherland found evidence for the presence of a G protein- coupled receptor for epinephrine in muscle cells. For this receptor to function normally, it must have at least how many binding sites, and what must be bound?
a. One: G protein
b. Two; epinephrine and G protein
c. Two: epinephrine and GTP
d. One: extracellular epinephrine
e. Three: epinephrine, G protein, and ATP
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