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: -Answer and Explanation: The type of molecule that needs facilitated diffusion to move across the plasma membrane are large or hydrophilic molecules.

Detailed explanation-3: -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-4: -Facilitated diffusion is one of the many types of passive transport. This means that it is a type of cellular transport where substances move along their concentration gradient.

Detailed explanation-5: -In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers. A concentration gradient exists for these molecules, so they have the potential to diffuse into (or out of) the cell by moving down it.