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Which of the following enzymes is not present in the patients of Phenylketonuria?

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Which of the following enzymes is not present in the patients of Phenylketonuria?

(a) Somatostatin

(b) Testosterone

(c) Phenylalanine hydroxylase

(d) Phenylalanine

I got this question in a national level competition.

This is a very interesting question from Inheritance Principles topic in portion Principles of Inheritance and Variation of Biology – Class 12

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Correct answer is (c) Phenylalanine hydroxylase

For explanation: The individual which is affected by phenylketonuria lacks a liver enzyme called phenylalanine hydroxylase which is responsible for converting phenylalanine, an amino acid into tyrosine, another amino acid.

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