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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.
Movement of substances across the plasma membrane by protein carrier molecules (integral membrane protein) --used when molecule cannot cross membrane or crosses very slowly. --protein carrier molecules are embedded in lipid, and have site which specifically binds the molecules. --binding of the molecule to the site promotes a conformational change in protein carrier, resulting in transport of molecule across membrane.