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How many isoenzymes does creatine kinase have?

  • A.2
  • B.4
  • C.5
  • D.None of the above

Answer: D

Correct answer: None of the above

Creatine kinase has three isoenzymes, made from two subunit types: CK-MM in skeletal muscle, CK-BB in brain, and the hybrid CK-MB in heart muscle. Since three is not among the options, the answer is none of them. The MB form’s rise in blood was long used to diagnose myocardial infarction.

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