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Why do cells need to be able to control movement of substances across the plasma membrane?
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Why do cells need to be able to control movement of substances across the plasma membrane?

User Lnediger
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Answer:

To move substances against a concentration or electrochemical gradient, the cell must use energy. Small substances constantly pass through plasma membranes. Active transport maintains concentrations of ions and other substances needed by living cells in the face of these passive movements.

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User TachikomaGT
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