Multiple Choice
In passive transport by simple diffusion, how does increasing molecular weight generally affect the rate of diffusion across a membrane (all else being equal)?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
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In the context of passive transport, how is osmosis different from diffusion?
A
Osmosis can occur only for nonpolar molecules, whereas diffusion can occur only for water.
B
Osmosis moves solutes from low concentration to high concentration, whereas diffusion moves solutes from high concentration to low concentration.
C
Osmosis is the diffusion of water across a selectively permeable membrane, whereas diffusion is the net movement of any particles down their concentration gradient (and may occur without a membrane).
D
Osmosis requires cellular energy (ATP), whereas diffusion is always energy-independent.
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