Multiple Choice
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?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
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Which of the following statements is true of facilitated diffusion across a cell membrane?
A
It occurs only for small nonpolar molecules that can pass directly through the lipid bilayer.
B
It moves solute against its concentration gradient by using energy from ATP.
C
It is not selective and cannot become saturated because solutes diffuse freely through open space in the membrane.
D
It requires a membrane transport protein and moves solute down its concentration gradient without direct ATP hydrolysis.
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Passive Transport: Diffusion and Osmosis practice set
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