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JAMB Biology 2002 Question 29

Question 29

Transport in Animals

The mammalian erythrocytes differ from the leucocytes at maturity because the erythrocytes are

  1. A.discoid and nucleated
  2. B.discoid and enucleated
  3. C.amoeboid and nucleated
  4. D.amoeboid and enucleated
Show the answer and explanation

Answer: B (discoid and enucleated)

Explanation

Mature red blood cells are disc-shaped (biconcave) and have no nucleus, which leaves more room for haemoglobin. White blood cells keep their nucleus and can change shape like an amoeba.