What term describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell?

• Correct Answer: endocytosis
• biosynthesis
• plasmosis
• exocytosis

Explanation: Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell, as shown in Figure below . Exocytosis occurs when a cell produces substances for export, such as a protein, or when the cell is getting rid of a waste product or a toxin. Newly made membrane proteins and membrane lipids are moved on top the plasma membrane by exocytosis. For a detailed animation of cellular secretion, see http://vcell. ndsu. edu/animations/constitutivesecretion/first. htm .

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