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11-11-2017
Biology

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A protein channel is a transport protein that
A. always moves substances against a concentration gradient. B. pumps ions out of a cell. C. serves as a tunnel for specific substances. D. always requires energy from the cell.

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mpete10323 mpete10323

11-11-2017

C is the best answer

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Аноним Аноним

11-11-2017

Answer: C

I hope this helps and have a wonderful day!

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