Which of the following disorders is caused by individuals lacking an enzyme which is needed to break down the amino acid phenylalanine,and if not treated with a proper diet avoiding phenylalanine,severe mental retardation occurs?

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Phenylketonuria (PKU)is the most commonly inherited metabolic disorder that affects nervous system development.Affected individuals lack an enzyme that is needed for the normal metabolism of the amino acid phenylalanine.Newborns are placed on a special diet,which must be continued until the brain is fully developed (around the age of 7 years),or else severe mental retardation occurs.

Which of the Following Disorders Is Caused by Individuals Lacking