Small molecules move through membranes in different ways --, Ask an Expert

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Small molecules move through membranes in different ways -- different for different molecules or compounds, that is.

Which of the following is true about such movement through membranes?

A. Active transport operates against a concentration gradient and requires an energy source, such as ATP.

B. Passive diffusion requires no membrane protein and operates along (rather than against) a concentration gradient.

C. Facilitated transport requires a membrane protein and operates along a concentration gradient.

D. All of the above are true.

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Category:- Biology
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