Which of the following best describes secondary active transport?
A) Secondary active transport involves the movement of a substance into a cell with its concentration gradient.
B) Secondary active transport involves the movement of a substance into a cell through a protein channel with its concentration gradient.
C) Secondary active transport occurs when one substance is coupled with the passive transport of a second substance.
D) Secondary active transport involves the movement of water by osmosis into a cell.
Answer: C
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