AP BIOLOGY

Detailed explanation-1: -Answer and Explanation: Facilitated diffusion is a specialized type of diffusion that is used to move large particles that cannot move through the membrane freely.

Detailed explanation-2: -Glucose molecules are too big to diffuse through the plasma membrane easily, so they are moved across the membrane through gated channels. In this way glucose diffuses very quickly across a cell membrane, which is important because many cells depend on glucose for energy.

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. Since the movement of substances is from greater to lesser concentrations, chemical energy is neither used nor required.

Detailed explanation-4: -Although glucose can be more concentrated outside of a cell, it cannot cross the lipid bilayer via simple diffusion because it is both large and polar, and therefore, repelled by the phospholipid membrane.

Detailed explanation-5: -There is a form of passive transport called facilitated diffusion. It occurs when molecules such as glucose or amino acids move from high concentration to low concentration facilitated by carrier proteins or pores in the membrane.