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

Options

A. fumaric acid and pyruvic acid
B. OA A and acetyl CoA
C. malic acid and acetyl CoA
D. succinic acid and pyruvic acid.

Answer

B

Explanation

Acetyl CoA (2-carbon compound) combines with oxaloacetate (4-carbon compound) in the presence of condering ezyme 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_(2) overset("Citrate synthase")(rarr) "Citrate + CoA"`