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Chemistry of Nucleotides-Multiple-choice questions

1- Which statement best describes Xanthine ? a) It is a direct precursor of Guanine b) It covalently binds to Allopurinol c) It is oxidized to form Uric acid d) It is oxidized to form Hypoxanthine e) It is a substrate rather than a product of the enzyme Xanthine oxidase 2- Methylated heterocyclic bases of

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