Dietetic Technician DTR Exam Prep

Category - Nutrition Care

Which of the following enzymes is missing in infants with phenylketonuria (PKU)?
  1. Ornithine transcarboxylase
  2. Phenylalanine hydroxylase
  3. Glucose -6 phosphatase
  4. Galactokinase
Explanation
Answer: B - The missing enzyme in phenylketonuria (PKU) is phenylalanine hydroxylase. PKU is an inborn error of metabolism in which phenylalanine cannot be broken down by the body due to a lack of this enzyme.
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