Question

When a hormone such as epinephrine binds to a GTP-bound receptor, the G protein alpha subunit...

When a hormone such as epinephrine binds to a GTP-bound receptor, the G protein alpha subunit leaves to activate adenylyl Cyclase.

When the alpha subunit re-associates with the beta/gamma subunits of the G protein, is the hormone still attached to the GTP-bound receptor?

When exactly does the hormone leave the receptor — is it when the G protein is GTP-activated or when the G protein is reassembled back into alpha/beta/gamma?
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Answer #1

1. ANSWER:- True
Explanation- When a hormone such as epinephrine binds to a GTP-bound receptor, the G protein alpha subunit leaves to activate adenylyl Cyclase.

2. Answer:- No,When the alpha subunit re-associates with the beta/gamma subunits of the G protein, the hormone not attached to the GTP-bound receptor.

3. Answer:- yes,
Explanation :- hormone leave the receptor when the G protein is GTP-activated or when the G protein is reassembled back into alpha/beta/gamma.

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