Which of the following is a characteristic of phenylketonuria?

Question

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Phenylketonuria (PKU) is caused by a deficiency or defect in phenylalanine hydroxylase, which is necessary for the metabolism of the amino acid phenylalanine. This results in a buildup of phenylalanine and its byproducts in the body, leading to intellectual disability, developmental delays, behavioral problems, and other health issues. Treatment includes a strict low-phenylalanine diet to prevent buildup and damage. Urine turning dark on standing due to air oxidation is a characteristic of alkaptonuria, another metabolic disorder. Phenylalanine is restricted in the diet of PKU patients, not increased. Finally, PKU can cause severe mental retardation in untreated individuals, but it is not a treatment option.

Which of the Following Is a Characteristic of Phenylketonuria