<prompt> Allopurinol inhibits which enzyme?Xanthine oxidaseKinaseLysyl oxidaseCyclooxygenase  <response>: Allopurinol inhibits Xanthine oxidase Mechanism-based inhibitionSuicidal inhibitors resemble the actual substrate of the enzyme. Enzymes binds to suicidal inhibitor catalytic process is staed. In the process of catalysis, enzyme undergoes irreversible covalent modification by the inhibitor active enzyme cant be regenerated. Enzyme catalyses its own destruction Suicidal Inhibitor Enzyme Allopurinol Xanthine oxidase Aspirin Cyclooxygenase 5-FU Thymidylate synthase Penicillin Transpeptidase Difluoromethylornithine Ornithine decarboxylase 