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Question
The net yield of ATP, except substrate-level phosphorylation, from Krebs cycle per glucose molecule is
The net yield of ATP, except substrate-level phosphorylation, from Krebs cycle per glucose molecule is
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Solution
The correct option is A 22
From one molecule of glucose, 38 ATP molecules can be produced during cellular respiration. Glycolysis produces net 2 ATP molecules by substrate level phosphorylation. Kreb cycle produces 2 ATP molecules by substrate level phosphorylation. About 34 ATP are produced from oxidative Phosphorylation. During Kreb cycle, 6 molecules of NAD+ are reduced to NADH and 2 molecules of FAD are reduced to FADH2. Now 6 NADH produce 6 x 3 = 18 ATP molecules. Similarly, 2 FADH2 produce 2 x 2 = 4 ATP molecules. Hence, total 18 + 4 = 22 molecules of ATP are produced per glucose molecule from Kreb cycle except substrate level phosphorylation.Thus, the correct answer is '22.'
From one molecule of glucose, 38 ATP molecules can be produced during cellular respiration. Glycolysis produces net 2 ATP molecules by substrate level phosphorylation. Kreb cycle produces 2 ATP molecules by substrate level phosphorylation. About 34 ATP are produced from oxidative Phosphorylation. During Kreb cycle, 6 molecules of NAD+ are reduced to NADH and 2 molecules of FAD are reduced to FADH2. Now 6 NADH produce 6 x 3 = 18 ATP molecules. Similarly, 2 FADH2 produce 2 x 2 = 4 ATP molecules. Hence, total 18 + 4 = 22 molecules of ATP are produced per glucose molecule from Kreb cycle except substrate level phosphorylation.
Thus, the correct answer is '22.'
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