試題詳解

17. What can lead to the development of the human genetic disease phenylketonuria (PKU)?
(A) A deficiency of protein in the diet
(B) Overproduction of ketone bodies
(C) Lack of phenylalanine decarboxylase
(D) Deficiency in aromatic amino acid transaminase
(E) Lack of an enzyme required for converting phenylalanine to tyrosine