The unicellular organisms ingest large molecules into their cytoplasm from the external environment without previously digesting them. This process is called___________?
Correct answer: C. Phagocytosis
- A. Diffusion
- B. Osmosis
- C. Phagocytosis
- D. Plasmolysis
Explanation
Phagocytosis is the engulfment of large solid particles or molecules by extensions of the cell membrane, forming an internal vesicle for digestion. Students may choose diffusion because it also moves substances across membranes, but diffusion does not engulf large particles and requires no vesicle formation.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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