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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. Carrier proteins (pumps) actively transport solutes (such as sodium, potassium, calcium, and magnesium ions) across a membrane, against their concentration gradient and require energy such as ATP. Transport is dependent upon the availability of carrier proteins and ATP.ctive Transport. Carrier proteins (pumps) actively transport solutes (such as sodium, potassium, calcium, and magnesium ions) across a membrane, against their concentration gradient and require energy such as ATP. Transport is dependent upon the availability of carrier proteins and ATP.