At the end of the electron transport system, oxygen combines with electrons and hydrogen ions to form ________, a waste product.
A) urea
B) FAD
C) water
D) NAD⁺
E) glucose

Question

Quizplus · Accepted Answer

The final electron acceptor in the electron transport system is oxygen, which combines with electrons and hydrogen ions to form water (H2O). Therefore, the correct answer is C. A is incorrect; urea is a waste product of protein metabolism and is not involved in the electron transport system. B is incorrect; FAD is a coenzyme involved in the Krebs cycle, not the electron transport system. D is incorrect; NAD+ is a coenzyme involved in both the Krebs cycle and the electron transport system, but it is not a waste product. Finally, E is incorrect; glucose is not a waste product of the electron transport system, but rather a starting molecule for cellular respiration.

At the End of the Electron Transport System, Oxygen Combines