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Biology 13 Online
OpenStudy (anonymous):

what is the function of active transport in moving small molecules and ions across cell membranes? give an example

OpenStudy (blues):

Active transport is the process by which cells move a substance against a concentration gradient. This requires energy - substances want to flow down their concentration gradients - so the question really asks "Why does the cell spend energy to do this - what does it get back in return?"

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