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  4. In which of the following steps of aerobic respiration of glucose, carbon dioxide is evolved? I. Glycolysis II. Link reaction III. Krebs cycle IV. Electron transport system

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Q. In which of the following steps of aerobic respiration of glucose, carbon dioxide is evolved?
I. Glycolysis
II. Link reaction
III. Krebs cycle
IV. Electron transport system

NTA AbhyasNTA Abhyas 2022

Solution:

In the link reaction pyruvic acid is converted into acetyl coenzyme A also producing reduced coenzyme NADPH + $H^{+}$ and carbon dioxide in the presence of enzyme pyruvate dehydrogenase. In the Kreb's cycle, carbon dioxide is evolved at two points:
a. During the conversion of isocitric acid to oxalosuccinic acid.
b. During the conversion of alpha-ketoglutaric acid to succinyl co-A