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Question

Identify enzyme A in the given reaction of Krebs' cycle.
OAA(4C)+AcetylCoA+H2OACitricacid(6C)+CoA

A
Oxaloacetate synthetase
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B
Citrate synthase
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C
Aconitase
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D
Dehydrogenase
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Solution

The correct option is C Citrate synthase
Citrate synthase catalyzes the condensation reaction of the two-carbon acetate residue from acetyl coenzyme A and a molecule of four-carbon oxaloacetate to form the six-carbon ciitrate. It is the reaction of Krebs' cycle.
Acetyl-CoA + oxaloacetate + H2O → Citrate + CoA-SH.
Thus, the correct answer is 'Citrate synthase.'

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