Cell Biology

- The electron transport chain (ETC) in mitochondria transfers electrons through a series of complexes.
- The final electron acceptor at the end of the ETC is oxygen (O ), which combines with electrons and protons to form water, so (C) is correct.
- NAD and FAD are electron carriers that deliver electrons to the ETC, but are not the final acceptors, so (A) and (B) are incorrect.
- Cytochrome c is an intermediate electron carrier, not the final acceptor, so (D) is incorrect.
Answer: