30. What amino acid catabolism needs α-keto acid decarboxylase? If the decarboxylase is defect, it will cause maple syrup urine disease.
(A) alanine
(B) valine
(C) tryptophan
(D) phenylalanine
(E) tyrosine.

1. 題目解析這道題目主要考察的是對...