Multiple Choice
In the context of passive transport across cell membranes, how are simple diffusion and facilitated diffusion similar?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
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In passive transport, how does increasing a cell membrane’s surface area (while keeping the concentration gradient and membrane permeability constant) affect the rate of diffusion across the membrane?
A
It increases diffusion only for water (osmosis) but not for solutes.
B
It has no effect on diffusion rate because diffusion depends only on the concentration gradient.
C
It increases the rate of diffusion because more membrane area is available for particles to cross per unit time.
D
It decreases the rate of diffusion because particles must travel farther across a larger membrane.
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