
Which of the following is/are produced in both glycolysis and the electron transport chain?
I. ATP
II. NADH
III. Oxygen
IV. FADH2

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Correct Answer: A. I only.
ATP is the only product formed in both glycolysis and the ETC. Item II is false: NADH is produced only in glycolysis, and it is used in the ETC. Items III and IV are false: oxygen and FADH2 are not produced in either of these processes.
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Photo attributed to Tobias von der Haar.