Which statement concerning phenylketonuria (PKU) is true?
A) It manifests due to excessive intake of fatty foods.
B) It is interesting to researchers because it does not require an interaction of genes and environment to be expressed.
C) Left untreated, it can cause intellectual disability.
D) For those affected, dietary restrictions are critical later in life.

Question

Quizplus · Accepted Answer

PKU is a genetic disorder caused by a deficiency in the enzyme phenylalanine hydroxylase, leading to high levels of phenylalanine in the blood. If untreated, this can result in intellectual disability, among other complications.

Which Statement Concerning Phenylketonuria (PKU) Is True