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© BrainMass Inc. brainmass.com March 4, 2021, 7:39 pm ad1c9bdddf
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Active transport is the motion of a molecule against the chemical or electrostatic gradient. such a movement always requires ...