A Levels Biology (9700)•9700/11/M/J/19

Explanation
Exocytosis releases substances outside the cell via vesicle fusion
Steps:
- Examine diagram: substance Z is inside a vesicle near the cell membrane.
- Vesicle fuses with membrane, opening to exterior.
- Substance Z moves out of cell.
- Process matches export mechanism.
Why B is correct:
- Exocytosis expels cellular products by merging vesicles with plasma membrane, as defined in cell biology.
Why the others are wrong:
- A. Endocytosis imports substances into the cell via vesicle formation.
- C. Phagocytosis engulfs solid particles through endocytosis.
- D. Pinocytosis absorbs extracellular fluid nonspecifically via endocytosis.
Final answer: B
Topic: Movement into and out of cells
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