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Registered Dietitian Exam Prep

Category - Nutrition Care

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Which of the following enzymes is missing in infants with phenylketonuria (PKU)?

Ornithine transcarboxylase
Phenylalanine hydroxylase
Glucose -6 phosphatase
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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