AP BIOLOGY

Detailed explanation-1: -Channel proteins, gated channel proteins, and carrier proteins are three types of transport proteins that are involved in facilitated diffusion. A channel protein, a type of transport protein, acts like a pore in the membrane that lets water molecules or small ions through quickly.

Detailed explanation-2: -An example of a carrier protein used in facilitated diffusion is the glucose transporter. Glucose transporters are a family of related carrier proteins that move glucose across the membrane. This function is extremely important to cells as glucose is the primary source of energy for cells.

Detailed explanation-3: -Carrier proteins are membrane transport proteins along with the channel proteins. As membrane transport proteins, they are located in biological membranes and their primary function is to move molecules from one site to another. These transporters though differ in certain aspects.

Detailed explanation-4: -Active transport uses carrier proteins, not channel proteins. These carrier proteins are different than the ones seen in facilitated diffusion, as they need ATP in order to change conformation.