Movement of the material across the cell membrane which does not requiring expenditure of metabolic energy is called__________?
Correct answer: B. Passive transport
- A. Active transport
- B. Passive transport
- C. Co-transport
- D. Counter transport
Explanation
Passive transport moves substances across the membrane down their concentration or electrochemical gradient without ATP expenditure, including diffusion and osmosis. Students may choose active transport because it also moves substances across membranes, but active transport requires metabolic energy and commonly moves substances against a gradient.
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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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