79. The human genetic disease phenylketonuria can result from _____.
① a defect in phenylalanine hydroxylase
② a defect in homogentisate dioxygenase
③ inability to convert phenylalanine to tyrosine
④ urine containing excessive phenylpyruvate
⑤ deficiency of phenylalanine in the diet
(A) ①②③
(B) ①③④
(C) ①②⑤
(D) ②③④
(E) ①③⑤
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(2) a defect in homo...
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