All of the following enzymes and their reactions are involved in the metabolism of Xenobiotics, EXCEPT:: (A) Cytochrome oxidase, (B) Cytochrome p 450, (C) Methylation, (D) Hydroxylation
Answer is A. Cytochrome oxidase is not mentioned as an enzyme in the metabolism of xenobiotics but Cytochrome P450 and Hydroxylation reactions are involved in Phase-1 metabolic reactions and Methylation forms a pa of phase II reactions. Ref: Harpers Biochemistry, 27th Edition, Page 633; Lippincott's Illustrated Reviews: Pharmacology, 4th Edition, Page 14; Goodman and Gilman's The Pharmacological Basis of Therapeutics, 11th Edition, Page 44