Multiple Choice
In animal cells, what is the primary mechanism by which water enters the cell across the plasma membrane under normal physiological conditions?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
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In the context of passive transport across cell membranes, how are simple diffusion and facilitated diffusion similar?
A
Both move substances down their concentration gradient without requiring cellular energy (ATP).
B
Both are limited to the movement of water molecules only.
C
Both can move molecules from low concentration to high concentration when needed by the cell.
D
Both require transport proteins (channels or carriers) embedded in the membrane.
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Passive Transport: Diffusion and Osmosis practice set
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