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  4. Krebs' cycle starts with the formation of a six carbon compound by reaction between

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Q. Krebs' cycle starts with the formation of a six carbon compound by reaction between

Respiration 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 tricarboxylic $6$-carbon compound called citric acid. It is the first product of Krebs' cycle. $CoA$ is liberated.
Acetyl $CoA +$ Oxaloacetic acid $+ H_2O$ $\xrightarrow{\text{citrate synthase} }$ Citrate $+ CoA$