Answer:
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.
Figure 4. Simple Diffusion across the Cell (Plasma) Membrane. The structure of the lipid bilayer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion. In contrast to facilitated diffusion, which does not require energy and carries molecules or ions down a concentration gradient, active transport pumps molecules and ions against a concentration gradient.
Explanation:
Facilitated diffusion because both move with the help of membrane protein.
Facilitated diffusion is the passive movement of molecules across the cell membrane with the help of a membrane protein. It is used by those molecules that are unable to cross the phospholipid bilayer e.g. large, polar molecules and ions etc freely.
In diffusion, molecules move from one place to another without the use of energy but in facilitated diffusion needs energy for the movement of molecules so we can conclude that facilitated diffusion is the movement of molecules across the cell membrane with the help of membrane protein.
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