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What is Zinc is a cofactor of and explain in detail?
Metalloenzymes: These enzymes hold the metals rather tightly which are not readily exchanged. 
Alcohol dehydrogenase, carbonic anhydrase, alkaline phosphatase, carboxypeptidase and aldolase contain zinc.
Phenol oxidase (copper); Pyruvate oxidase (manganese); Xanthine oxidase (molybdenum); Cytochrome oxidase (iron and copper).
Satyanrayana, Ed 3, page no 91