Question

a white blood cell engulfing a bacterium is an example of ______ . a pinocytosis b exocytosis c active transport d phagocytosis

Explanation:

• Option A: Pinocytosis is the uptake of liquid or small dissolved substances, not solid particles like bacteria.
• Option B: Exocytosis is the process of releasing substances from a cell, not taking in.
• Option C: Active transport involves moving molecules against a concentration gradient via protein pumps, not engulfing large particles.
• Option D: Phagocytosis is the process by which cells (like white blood cells) engulf large solid particles, such as bacteria, which matches the scenario.

Answer:

D. phagocytosis