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Active transport - a region of higher concentration Because...

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Active transport A   fourth   method   for   movement   across   the   membrane   is   active  transport.   When active transport is taking place, a protein moves a certain  material across the membrane from a region of lower concentration to 
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Unformatted text preview: a region of higher concentration. Because this movement is happening against the concentration gradient, the cell must expend energy that is usually derived from a substance called adenosine triphosphate or ATP....
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