As electrons move along the electron transport chain, they lose potential energy. How is the energy that is released used by the cell?
A. The energy is used to transport protons against their concentration gradient.
B. The energy is used to pump NAD+ into the cytoplasm so it can be used in glycolysis.
C. The energy is converted directly into ATP.
D. The energy is used to pump electrons along the electron transport chain.
Answer: A
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