Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologyeasymcq1 pt

A secretory vesicle completes fusion with the plasma membrane during exocytosis. Which outcome follows immediately?

A.The cargo spills into the cytosol for further processing
B.Vesicle contents exit the cell while the vesicle membrane joins the plasma membrane
C.The cell permanently loses the patch of membrane that formed the vesicle
D.The emptied vesicle detaches intact and returns to the Golgi

Explanation

Core Concept

During exocytosis, fusion of the vesicle membrane with the plasma membrane exposes the vesicle lumen to the extracellular space, releasing soluble cargo. The vesicle membrane becomes part of the plasma membrane and can later be retrieved or remodeled through endocytic trafficking. The secreted cargo itself leaves the cell, so it is misleading to say both cargo and membrane are simply 'conserved.'

Correct Answer

BVesicle contents exit the cell while the vesicle membrane joins the plasma membrane

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