When a substance cannot cross the plasma membrane by itself,and instead uses a protein carrier to move from high to low concentration,it uses
A)facilitated diffusion.
B)active transport.
C)osmosis.
D)simple diffusion.

Question

Quizplus · Accepted Answer

Facilitated diffusion is the process by which a substance uses a protein carrier to move from high to low concentration. This is different from active transport, which requires energy to move a substance against its concentration gradient. Osmosis is the diffusion of water across a selectively permeable membrane, while simple diffusion is the movement of a substance from high to low concentration without the use of a protein carrier. Therefore, the correct answer is A) facilitated diffusion as it matches the given conditions.

When a Substance Cannot Cross the Plasma Membrane by Itself,and