AP BIOLOGY

Detailed explanation-1: -These channels are glycoproteins (proteins with carbohydrates attached) that allow molecules to pass through the membrane.

Detailed explanation-2: -Transmembrane channels, also called membrane channels, are pores within a lipid bilayer. The channels can be formed by protein complexes that run across the membrane or by peptides. They may cross the cell membrane, connecting the cytosol, or cytoplasm, to the extracellular matrix.

Detailed explanation-3: -Aquaporins are channel proteins that allow water to cross the membrane very quickly, and they play important roles in plant cells, red blood cells, and certain parts of the kidney (where they minimize the amount of water lost as urine).

Detailed explanation-4: -Membrane channels are complexes of membrane proteins or peptides that mediate passive transport of solutes by forming an aqueous diffusion pore.

Detailed explanation-5: -A transport protein completely spans the membrane, and allows certain molecules or ions to diffuse across the membrane. Channel proteins, gated channel proteins, and carrier proteins are three types of transport proteins that are involved in facilitated diffusion.