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valentinak56 [21]
3 years ago
11

Active transport occurs when molecules are moved across a semi-permeable membrane and ____ a concentration gradient.

Biology
1 answer:
jeyben [28]3 years ago
5 0

Answer:

Active transport occurs when molecules are moved across a semi-permeable membrane and <em><u>UP</u></em><em><u> </u></em><em><u>(against)</u></em> a concentration gradient.

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