Which of the following enzymes is involved in the breakdown of phenylalanine in the liver?

A Phenylalanine hydroxylase ✓
B Tyrosinase
C Homogentisate 1,2-dioxygenase
D Branched-chain alpha-keto acid dehydrogenase

Explanation

Phenylalanine hydroxylase is the enzyme responsible for converting phenylalanine to tyrosine in the liver.

Source

Harper's Illustrated Biochemistry
Metabolic and Nutritional Disorders Amino Acid Metabolism Phenylketonuria Hard MEDICAL Confidence: high