A 20 year old male with mild mental retardation has had two successive strokes within a year.-UKMLA PLAB AMC USMLE Prometric MCQ

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A 20 year old male with mild mental retardation has had two successive strokes within a year.

on Sunday, May 22, 2011

Question Number 0229

Question:
A 20 year old male with mild mental retardation has had two successive strokes within a year. On examination he had a marfanoid habitus, with long limbs and pectus excavatum. The most likely enzyme defect is

a) the MM isoenzyme of Creatine kinase
b) the MB isoenzyme of Creatine kinase
c) the BB isoenzyme of Creatine kinase
d) cystathionine synthetase
e) Lactic dehydrogenase