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  4. The first stable compound formed in Krebs' cycle is

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Q. The first stable compound formed in Krebs' cycle is

COMEDKCOMEDK 2012Respiration in Plants

Solution:

Acetyl CoA (2-carbon compound) combines with oxaloacetate (4-carbon compound) in the presence of condensing enzyme citrate synthase to form a tricarboxy lie acid 6-carbon compound called citric acid. It is the first product of Krebs' cycle. CoA is liberated.
Acetyl CoA + Oxaloacetate + $H_2O \xrightarrow{\text{Citrate Synthase}}$ Citrate +CoA