Regarding phenylketonuria (PKU), which of the following statements is TRUE?
A)PKU is a sex-linked hereditary condition.
B)PKU results from a lack of an important enzyme and is linked to very low levels of dopamine.
C)PKU is a condition caused by an extra chromosome at pair 21.
D)PKU results from an insufficient supply of thyroid hormone.

Question

Quizplus · Accepted Answer

PKU is caused by a deficiency in the enzyme phenylalanine hydroxylase, which is necessary for the conversion of phenylalanine to tyrosine. Tyrosine is a precursor for dopamine, so low levels of tyrosine can lead to low levels of dopamine.

Regarding Phenylketonuria (PKU), Which of the Following Statements Is TRUE