The following happens when a G-protein-coupled receptor activates a G protein.
(a) The ß subunit exchanges its bound GDP for GTP.
(b) The GDP bound to the a subunit is phosphorylated to form bound GTP.
(c) The a subunit exchanges its bound GDP for GTP.
(d) It activates the a subunit and inactivates the ß? complex.
Answer:
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