Carrier specificity,expernditure of energy,and ability to transport substances against a concentration gradient are all characteristics of

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Carrier specificity, expenditure of energy, and ability to transport substances against a concentration gradient are all characteristics of active transport. Simple, passive diffusion and facilitated diffusion do not require energy and do not move substances against a concentration gradient. Endocytosis and exocytosis are forms of bulk transport and do not involve carriers or specificity for particular molecules.

Carrier Specificity,expernditure of Energy,and Ability to Transport Substances Against a Concentration