試題詳解

20. All are characteristics of xanthine oxidase EXCEPT?
(A) present in large amounts in liver, intestinal mucosa and milk,
(B) uses molecular oxygen and produces H₂O₂,
(C) involved in direct production of urea,
(D) possesses an electron-transport chain with FAD, Fe-S cluster and molybdenum cofactor
(E) all are true.