When 100% carbon is oxidized to $C O_{2}$ , the efficiency of such a respiration is

40%

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60%

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90%

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100%

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Solution

The correct option is A 40%
The total energy yield from 38 ATP molecules comes to 1292kJ energy (one ATP molecule yields 34kJ of energy). The energy released by one glucose on complete (100%) oxidation of carbon corresponds to 2870kJ. Thus, the efficiency is approximately 45%.

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