Essential Biochemistry - Protein Metabolism (Section 1 - No. 44)

The condition known as phenylketonuria is due to a deficiency in which enzyme?

Phenylalanine hydroxylase

Tyrosine transaminase

Homogentisate oxidase

Histidine decarboxylase

Phenylketonuria is due to a deficiency in phenylalanine hydroxylase.