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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 substa…

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 substa…
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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.

User Kiku
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C is the best answer
User Janica
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Answer: C


I hope this helps and have a wonderful day!
User Mr Sam
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