The movement of molecules across a membrane from an area of lower concentration to an area of higher concentration with the expenditure of energy is called

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Quizplus · Accepted Answer

Active transport involves the movement of molecules against the concentration gradient, from an area of lower concentration to an area of higher concentration with the expenditure of energy. Facilitated diffusion and passive diffusion both involve the movement of molecules down the concentration gradient, from an area of higher concentration to an area of lower concentration, without the expenditure of energy. Osmosis involves the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

The Movement of Molecules Across a Membrane from an Area