AP Biology Quiz
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CELL COMMUNICATION AND CELL CYCLE
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In yeast, pheromone F binds a GPCR on the plasma membrane. Shortly after binding, the G protein's beta-gamma subunits dissociate from the alpha subunit and interact with a downstream effector at the membrane. If a mutation prevents dissociation of the subunits, F binding still occurs but the effector is not activated. Which of the following best explains the earliest blocked step?
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