Many G proteins have three polypeptide subunits that can bind a
A) hormone, a receptor, and an effector.
B) signal, a receptor, and an effector.
C) signal, GDP/GTP, and ATP.
D) receptor, GDP/GTP, and an effector.
E) signal, a receptor, and ATP/GTP.

Question

Quizplus · Accepted Answer

G proteins have three subunits: alpha, beta, and gamma. The alpha subunit binds to GDP/GTP, the beta and gamma subunits function together as a single unit and can interact with the effector, and the receptor binds to the extracellular signal. So, option D is the best choice among the given options.

Many G Proteins Have Three Polypeptide Subunits That Can Bind