The Electrons That Are Present in NADH and FADH₂ Are

question 40

Multiple Choice

The electrons that are present in NADH and FADH₂ are very high energy and theoretically sufficient to produce ATP alone. Why then have biological systems evolved a way that uses the various steps of cellular respiration to produce ATP?

• A)because steps in respiration allow for a controlled release of energy in small increments
• B)because all living organisms must use oxygen and therefore must carry out cellular respiration
• C)because it would be less efficient to produce ATP directly from NADH and FADH₂
• D)because the amount of ADP is insufficient to phosphorylate and make ATP

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