Multiple choice

Phenylketonuria is caused due to the deficiency of

  1. phenylalanine hydroxylase

  2. dihydropteridine reductase

  3. homogentisic acid oxidase

  4. SAM

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A Correct answer
Explanation

Phenylketonuria (PKU) is an inherited metabolic disorder caused by a deficiency of the enzyme phenylalanine hydroxylase, which is required to convert phenylalanine to tyrosine.