Question

Much of the carbon dioxide that you expel in your breath comes from reactions catalyzed by which two enzymes of the citric acid cycle?

Succinyl CoA Synthetase and Aconitase

Malate Dehydrogenase and Succinyl CoA Synthetase

Fumarase and Succinate Dehydrogenase

Aconitase and Malate Dehydrogenase

Isocitrate Dehydrogenase and α-ketoglutarate Dehydrogenase

Answer 1

Ans:- Isocitrate dehydrogenase and -ketoglutarate dehydrogenase

explanation:- in citric acid cycle isocitrate dehydrogenase convert D-isocitrate into -ketoglutarate in presence of NAD+ and release first molecule of CO2. -ketoglutarate get converted into succinyl co-A in presence of enzyme -ketoglutarate dehydrogenase and NAD+. this reaction release another CO2 molecule in citric acid cycle. the reactions catalyse by other enzymes in citric acid cycle do not produce CO2.