Question: When a trimeric G protein is activated by a cell - surface receptor, the alpha subunit exchanges its bound GDP for GTP . it dissociates

When a trimeric G protein is activated by a cell-surface receptor,
the alpha subunit exchanges its bound GDP for GTP.
it dissociates into an active alpha subunit and an inactive beta/gamma subunit.
it dissociates into a free alpha subunit and a beta/gamma subunit.
the GDP bound to the alpha subunit is phosphorylated to form bound GTP.
When a trimeric G protein is activated by a cell

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