SAT Subject Biology Practice Question 15: Answer and Explanation

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Question: 15

1. How does the ATP synthase enzyme function in the cell?

A. It uses energy to move ions against their concentration gradient by removing a phosphate group from ATP.
B. It uses the power of ions moving against their concentration gradient to add a phosphate group to ADP.
C. It uses the power of ions moving down their concentration gradient to add a phosphate group to ADP.
D. It uses the power of ions moving against their concentration gradient to remove a phosphate group from ATP.
E. It uses the power of ions moving down their concentration gradient to remove a phosphate group from ATP.

Correct Answer: C

Explanation:

The ATP synthase enzyme, present in membranes, uses the power of hydrogen ions moving down their concentration gradient to add a phosphate group to ADP, producing ATP.

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