What fraction of CO2 exhaled by animals is generated by the reactions of citric acid cycle, if glucose is the sole source of energy?
A
2/6
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B
3/6
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C
1/6
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D
6/6
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Solution
The correct option is A2/6 The citric acid cycle also known as the TCA cycle or the Kreb cycle is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats ad proteins. If glucose is the sole source of energy then 2/6 carbon dioxide is exhaled by an animal.