5
Question
Energy released in aerobic respiration is higher than the one available from anaerobic respiration by
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Solution
Total energy yield of aerobic respiration
The total energy yield of aerobic respiration is the sum total of energy of glycolysis and that of mitochondrial reactions. A glucose molecule at the end of glycolysis yields 2 NADH (6 ATP molecules) and 2 ATP molecules by substrate-level phosphorylation. So, the total yield of ATP in glycolysis is 8.
The conversion of pyruvate to acetyl CoA yields 2 NADH (6 ATP). Further, in the mitochondria the citric acid cycle yields total of 2 ATP/GTP, 6 NADH(18 ATP) and 2FADH2 (4 ATP).
So the total yield of ATP is 30. Hence the sum of all the steps gives 38 molecules of ATP, which is the total energy produced through Aerobic respiration.
Comparison of energy yield
Energy released in aerobic respiration is 19 times higher than that of anaerobic respiration.
Final answer: (B) 19 times
The total energy yield of aerobic respiration is the sum total of energy of glycolysis and that of mitochondrial reactions. A glucose molecule at the end of glycolysis yields 2 NADH (6 ATP molecules) and 2 ATP molecules by substrate-level phosphorylation. So, the total yield of ATP in glycolysis is 8.
The conversion of pyruvate to acetyl CoA yields 2 NADH (6 ATP). Further, in the mitochondria the citric acid cycle yields total of 2 ATP/GTP, 6 NADH(18 ATP) and 2FADH2 (4 ATP).
So the total yield of ATP is 30. Hence the sum of all the steps gives 38 molecules of ATP, which is the total energy produced through Aerobic respiration.
Comparison of energy yield
Energy released in aerobic respiration is 19 times higher than that of anaerobic respiration.
Final answer: (B) 19 times
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