19. All of the following are characteristics of phenylketonuria EXCEPT?
(A) untreated patients suffer severe mental retardation,
(B) air oxidation causes urine to turn dark on standing,
(C) treated by putting patient on a diet low in phenylalanine,
(D) excretion of phenylpyruvate,
(E) deficiency or defect in phenylalanine hydroxylase.
阿摩線上測驗
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