Question

Why is facilitated diffusion necessary?

Answer 1

It 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. The plasma membrane needs these molecules in order for the cells and the body to function

Answer 2

Answer:

to cross the plasma membrane.

Explanation:

Two classes of proteins that mediate facilitated diffusion are generally distinguished: carrier proteins and channel proteins.