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The following are red cell enzymes except for :

  • A.Phosphoglucomutase
  • B.Adrylate kinase
  • C.Haptoglobin
  • D.Peroxidase

Answer: C

The one that is not a red cell enzyme is haptoglobin.

Haptoglobin is a plasma (serum) protein, an alpha-2 globulin that binds free haemoglobin. It is a classic serum protein marker in forensic serology, with types Hp 1-1, 2-1 and 2-2, but it is not an enzyme and not found inside red cells.

Phosphoglucomutase (PGM) and adenylate kinase (printed 'Adrylate kinase') are polymorphic enzymes of red cells used in stain typing before DNA methods, and red cells also contain peroxidase activity, such as glutathione peroxidase.

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