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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.
An example of a carrier protein that carries out passive transport is the glucose transporter, which is located in the plasma membrane of all mammalian cell types. On liver cells the carrier can be open toward the outside of a cell or toward the inside (Fig. 14).n example of a carrier protein that carries out passive transport is the glucose transporter, which is located in the plasma membrane of all mammalian cell types. On liver cells the carrier can be open toward the outside of a cell or toward the inside (Fig. 14).