AP BIOLOGY

Detailed explanation-1: -Facilitated diffusion therefore allows polar and charged molecules, such as carbohydrates, amino acids, nucleosides, and ions, to cross the plasma membrane. Two classes of proteins that mediate facilitated diffusion are generally distinguished: carrier proteins and channel proteins.

Detailed explanation-2: -In facilitated diffusion, substances move into or out of cells down their concentration gradient through protein channels in the cell membrane. Simple diffusion and facilitated diffusion are similar in that both involve movement down the concentration gradient.

Detailed explanation-3: -Facilitated diffusion is the passive movement of substances, such as biological molecules or ions, across a plasma membrane by means of a transport protein located in the plasma membrane.

Detailed explanation-4: -Facilitated diffusion is the process of moving molecules from high to low concentration across a membrane by using a protein channel in the membrane. Facilitated diffusion does not use energy but relies on a protein to facilitate movement.