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Movement in and out of cells · MediumQuestion
Which statement best distinguishes osmosis from diffusion?
- A. osmosis requires energy from ATP; diffusion does not
- B. osmosis only moves water molecules across a partially permeable membrane, down a water-potential gradient
- C. osmosis moves solutes from low to high concentration
- D. diffusion only happens in liquids; osmosis only in gases
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Movement in and out of cellsAnswer
Correct answer
B. osmosis only moves water molecules across a partially permeable membrane, down a water-potential gradient
Both are passive. Diffusion is the net movement of any particle from a region of higher to lower concentration. Osmosis is the special case for water molecules through a partially permeable membrane, down a water-potential gradient.
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