LABORATORY REVIEW
CELL RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How many protons are required to generate a molecule of ATP through oxidative phosphorylation?
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2 protons
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4 protons
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6 protons
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8 protons
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10 protons
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Explanation:
Detailed explanation-1: -But, one proton is needed to get substrate Pi into matrix, so the total is 4 protons per ATP.
Detailed explanation-2: -ATP-synthase synthesizes 1 ATP for 4 H+ ions.
Detailed explanation-3: -One NADH molecule is equivalent to three ATP molecules inside the mitochondria.
Detailed explanation-4: -Four protons are needed to synthesize 1 ATP. Since 10 protons are pumped for every NADH, 1 NADH yields 2.5 (10/4) ATP. Six protons are pumped for every FADH2, so 1 FADH2 yields 1.5 (6/4) ATP. Cellular respiration produces a maximum of 10 NADH and 2 FADH2 per glucose molecule.
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