A 1-year-old boy is brought to the pediatrician because his parents have noticed that he is mutilating himself by chewing on his lips.On examination, the child is found to be mentally retarded, and tophi are present in the earlobes.Which of the following enzymes is most likely deficient in this child?
A) Adenosine deaminase.
B) Hypoxanthine-guanine phosphoribosyltransferase.
C) Phosphoribosylpyrophosphate synthetase.
D) Xanthine oxidase.
E) Thymidylate kinase.
Correct Answer:
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