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    Active transport

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    Active transport is the

    A) diffusion of molecules within a cell

    B) movement of molecules into or out of a cell against a concentration gradient

    C) movement of molecules into or out of a cell down a concentration gradient

    D) movement of molecules into or out of a cell using special proteins and not requiring an expenditure of energy.

    E) rapid movement of molecules in a solution

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    https://brainmass.com/biology/membrane-transport/active-transport-114039

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    Active transport is the motion of a molecule against the chemical or electrostatic gradient. such a movement always requires ...

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