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2 September, 00:26

What fraction of the carbon dioxide exhaled by animals is generated by the reactions of the citric acid cycle

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  1. 2 September, 00:46
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    1/3

    Explanation:

    Pyruvate is produced by the glycolysis in cytoplasm. The oxidation of pyruvate takes place in mitochondrial matrix.

    Pyruvate is converted to acetyl-CoA in the reaction given below:

    Pyruvate + NAD⁺ + CoA-SH ⇒ acetyl-CoA + NADH + CO₂

    1 molecule of carbon dioxide is eliminated from 1 molecule of pyruvate.

    Also,

    2 molecules of carbon dioxide is eliminated from 2 molecules of pyruvate (as glucose on glycolysis yields 2 molecules of pyruvate).

    Also, acetyl-CoA further goes into the citric acid cycle and produces 2 molecules of carbon dioxide.

    Thus pyruvate produces total 3 molecules of CO₂ and hence glucose produces 6 molecules of CO₂ (as glucose on glycolysis yields 2 molecules of pyruvate)

    Thus,

    Fraction = 2/6 = 1/3
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