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Biology
Ray Mooney
5 January, 21:39
The process of transport across cell membrain
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Braden Holmes
5 January, 21:48
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Molecules and ions move spontaneously down their concentration gradient (i. e., from a region of higher to a region of lower concentration) by diffusion. Molecules and ions can be moved against their concentration gradient, but this process, called active transport, requires the expenditure of energy (usually from ATP).
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