AP BIOLOGY

Detailed explanation-1: -Carrier proteins are responsible for the facilitated diffusion of sugars, amino acids, and nucleosides across the plasma membranes of most cells.

Detailed explanation-2: -Facilitated Diffusion Requires Membrane Carrier Proteins Facilitated diffusion is also calledcarrier-mediated diffusion because a substance transported in this manner diffuses through the membrane with the help of a specific carrier protein. That is, the carrierfacilitates diffusion of the substance to the other side.

Detailed explanation-3: -Channel proteins are a type of facilitated diffusion where molecules are moved across the membrane through a protein, without using energy. Channel proteins only move specific substances, which is determined by their charge, size, and shape.