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Facilitated diffusion requires. enzymes. carrier proteins. lipid carriers. carbohydrate carriers. lipid or carbohydrate carriers. 2. Facilitated diffusion occurs. into the cell only. out of the cell only.
Active transport requires chemical energy because it is the movement of biochemicals from areas of lower concentration to areas of higher concentration. Passive transport moves biochemicals from areas of high concentration to areas of low concentration; so it does not require energy. What functions do carrier proteins perform in active transport? Carrier proteins allow molecule to bind to them; they change their shape to transport material across the cell membrane.