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27 June, 08:30

When does the cell have to use active transport?

a. when the cell has low energy

b. when the cell is in a highly concentrated solution

c. to move molecules across the membrane quickly

d. to move molecules across the membrane against a gradient

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Answers (1)
  1. 27 June, 09:29
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    I believe that a cell must use active transport to move molecules across the membrane against a gradient. Your answer should be D.
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