Which absorption mechanism requires both a carrier molecule and energy to move across a cell membrane?

Question

Quizplus · Accepted Answer

Active transport requires a carrier molecule and energy (usually in the form of ATP) to move molecules across a cell membrane against their concentration gradient. Simple diffusion does not require a carrier molecule or energy, and occurs down the concentration gradient. Osmosis is the diffusion of water molecules across a semipermeable membrane and also does not require a carrier molecule or energy. Facilitated diffusion requires a carrier molecule but does not require energy, and occurs down the concentration gradient.

Which Absorption Mechanism Requires Both a Carrier Molecule and Energy