1 MCQs in Biochemistry for NEET PG
A 5-year-old girl presents with progressive neurological decline, ataxia, and hepatosplenomegaly. Urine organic acid analysis reveals elevated methylmalonic acid and homocysteine. Serum cobalamin level is normal, but methylmalonic CoA mutase activity is severely reduced. Which of the following metabolic defects best explains the clinical and biochemical findings?
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