In phenylketonuria (PKU), an enzyme that converts one amino acid into another does not work properly. Which of the following is the most likely cause of this genetic condition?

Question

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A mutation in the DNA sequence that codes for the enzyme is the most likely cause of phenylketonuria (PKU). This genetic condition occurs when there is a mutation in the gene responsible for producing the enzyme phenylalanine hydroxylase, which is necessary for converting the amino acid phenylalanine into tyrosine.

In Phenylketonuria (PKU), an Enzyme That Converts One Amino Acid