The hereditary inability of tissue cells to metabolize the amino acid phenylalanine, which can result in brain damage and retardation unless a special diet low in phenylalanine is followed, is called:

The hereditary inability of tissue cells to metabolize the amino acid phenylalanine, which can result in brain damage and retardation unless a special diet low in phenylalanine is followed, is called:



A) cystic fibrosis
B) cleft lip
C) cleft palate
D) phenylketonuria
E) tracheoesophageal fistula


Answer: d


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