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A red blood cell in a mature human lacks

  • A.haemoglobin within its cytoplasm
  • B.the ability to change its shape
  • C.a nucleus and most organelles
  • D.a plasma membrane of any kind

Answer: C

Extruding the nucleus makes room for more haemoglobin and lets the cell deform through narrow capillaries. The cost is an inability to repair itself or to divide, which limits its working life to about four months in circulation.

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