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egoroff_w [7]
3 years ago
9

The process of transport across cell membrain

Biology
1 answer:
professor190 [17]3 years ago
7 0

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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