Multiple choice general knowledge sports

do RBC have nucleus..??

  1. there is nothing called nucleus

  2. yes

  3. only some have

  4. no
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mature mammalian red blood cells (RBCs) lack a nucleus to create maximum space for hemoglobin, the oxygen-carrying protein. This enucleation happens during RBC development in the bone marrow. Option B is incorrect because mammalian RBCs lose their nucleus before entering circulation. Other vertebrates (birds, fish) do have nucleated RBCs, but the question clearly refers to human biology.

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