The Genetic Condition Called Phenylketonuria Results from a Defect in a Gene

question 7

Multiple Choice

The genetic condition called phenylketonuria results from a defect in a gene called PAH which helps create phenylalanine hydroxylase, the enzyme that breaks down the amino acid phenylalanine. What is the outcome of this condition and the lack of this enzyme?

• A) Phenylalanine accumulates.
• B) Phenylalanine is completely used up, deleting its stores in the body.
• C) A different enzyme begins breaking down phenylalanine.
• D) Phenylalanine hydroxylase accumulates.

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