Concept 8 - Concept 8.4 Active transport uses energy to...

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Concept 8.4 Active transport uses energy to move solutes against their gradients Some transport proteins can move solutes across membranes against their concentration  gradient, from the side where they are less concentrated to the side where they are more  concentrated. This  active transport  requires the cell to expend metabolic energy. Active transport enables a cell to maintain its internal concentrations of small molecules  that would otherwise diffuse across the membrane. Active transport is performed by specific proteins embedded in the membranes. ATP supplies the energy for most active transport. ATP can power active transport by transferring a phosphate group from ATP (forming  ADP) to the transport protein. This may induce a conformational change in the transport protein, translocating the solute  across the membrane. The 
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Concept 8 - Concept 8.4 Active transport uses energy to...

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