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

Question

Quizplus · Accepted Answer

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 active transport. This is the opposite of passive diffusion, which occurs spontaneously without the expenditure of energy, and facilitated diffusion, which relies on the assistance of transport proteins. Osmosis, on the other hand, is the movement of water molecules across a membrane from an area of lower solute concentration to an area of higher solute concentration, and is a type of passive diffusion. Therefore, the best choice is D: active transport.

The Movement of Molecules Across a Membrane from an Area