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OpenStudy (anonymous):
How can membrane proteins push molecules across a membrane AGAINST a concentration gradient (from low to high)? What energy molecule is 'spent' to do this?
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OpenStudy (aaronq):
by means of a transport molecule e.g. ATPase. the energy molecule is ATP, adenosine triphosphate, the dissociation of one of the phosphoanhydride bonds provides the energy
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