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30 August, 23:11

How can substances be transported across a membrane against their concentration gradient?

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  1. 30 August, 23:33
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    Answer: To move substances against a concentration or electrochemical gradient, a cell must use energy.

    Explanation:

    This occurs because During active transport, substances move against the concentration gradient from an area of low concentration to an area of high concentration which is a "active" progress which requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.
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