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Question

Biology Question on Aerobic Respiration

The first stable compound formed in Krebs' cycle is

A

acetyl CoA

B

citric acid

C

oxaloacetic acid

D

fumaric acid.

Answer

citric acid

Explanation

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+H2O−>[Citrate Synthase]Citrate+CoA { Acetyl \,CoA + Oxaloacetate + H_2O ->[Citrate \, Synthase] Citrate +CoA}