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Uses energy to move solutes against their gradients; requires the cell to expend metabolic energy; enables a cell to maintain its internal concentrations of small molecules that would otherwise diffuse across he membrane ; ATP supplies the energy for

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1. Uses energy to move solutes against their gradients; requires the cell to expend metabolic energy; enables a cell to maintain its internal concentrations of small molecules that would otherwise diffuse across he membrane ; ATP supplies the energy for





 
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