The effects of untreated phenylketonuria (PKU) are
A) markedly increased blood levels of phenylalanine, resulting in obsessive-compulsive disorder in adulthood.
B) markedly increased blood levels of phenylalanine, resulting in severe mental retardation.
C) markedly increased blood levels of phenylalanine, resulting in severe dyslexia.
D) markedly increased blood levels of glycogen, resulting in severe dyslexia.
E) markedly increased blood levels of glycogen, resulting in severe mental retardation.

Question

Quizplus · Accepted Answer

Phenylketonuria (PKU) is a genetic disorder that results in the inability to metabolize an amino acid called phenylalanine. This leads to markedly increased blood levels of phenylalanine, which can cause severe mental retardation if left untreated. A low phenylalanine diet is necessary for individuals with PKU to prevent this outcome.

The Effects of Untreated Phenylketonuria (PKU) Are