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Which of the following enzymes do not use Fe^2+ or Fe^3+ ions as cofactors?

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Which of the following enzymes do not use Fe^2+ or Fe^3+ ions as cofactors?

(a) Cytochrome oxidase

(b) Dinitrogenase

(c) Catalase

(d) Peroxidase

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This interesting question is from Enzymes topic in portion Enzymes of Enzyme Technology

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Correct answer is (b) Dinitrogenase

The best explanation: Cofactor are those additional non protein chemical component of an enzyme which are required for its optimum activity. Cytochrome oxidase, catalase, and peroxidase are the enzymes which uses Fe^2+ or Fe^3+ ions as cofactors. For dinitrogenase, the cofactor used is molybdenum.

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