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Which of the following is not an enzyme?

(a) Ribonucleotide reductase

(b) Selenium

(c) Glutathione peroxidase

(d) Carbonic anhydrase

I have been asked this question in examination.

My question is from Enzymes topic in division Enzymes of Enzyme Technology

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Right answer is (c) Glutathione peroxidase

Explanation: Enzyme is referred to as a substance which acts as a catalyst to bring about a specific biochemical reaction. Ribonucleotide reductase, Glutathione peroxidase, and Carbonic anhydrase are the enzymes. Whereas selenium is not an enzyme but a cofactor, which are referred to as additional non protein chemical component of an enzyme which is required for optimum activity.

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