Which of the following enzymes do not use Zn2+ ions as cofactors?

Which of the following enzymes do not use Zn2+ ions as cofactors? Correct Answer Propionyl CoA carboxylase

The following enzymes use Zn2+ ions as cofactors: carbonic anhydrase, alcohol dehydrogenase, carboxypeptidase A and B. Propionyl CoA carboxylase is an enzyme which uses potassium as the cofactor.
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