Which one of the following cells does not have a nucleus:
Correct answer: D. Platelets
- A. Eosinophils
- B. Neutrophils
- C. Basophils
- D. Platelets
Explanation
Platelets are irregularly shaped and typically measure only 2-3 micrometers in diameter. Platelets do not possess a nucleus as they are not true cells, but are instead classified as cell fragments produced by megakaryocytes. These are involved in blood clotting.Neutrophils, eosinophils, and basophils are all types of white blood cells that contain a nucleus.
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Specific defense mechanisms protect the body through antigen recognition by B and T lymphocytes. The topic covers clonal selection, antibody production, plasma and memory cells, cell-mediated responses, helper and cytotoxic T cells, and the difference between primary and secondary immune responses.
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