does mature RBC contain nucleas or not?
Answers
Answer:
No, mature red blood cells lack a nucleus.
reason:
When red blood cells (erythrocytes) are produced in the bone marrow, they initially do contain a nucleus. In maturation the cell will extrude its nucleus, a process called enucleation. When the red blood cells enter circulation, they don't have a nucleus.
The lack of a nucleus is an adaptation of the cell to be better equipped for its task. The lack of a nucleus allows it to carry more oxygen. The cell is also more flexible, improving its ability to travel through capillaries that are about half the size of the cell itself.
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As red blood cells contain no nucleus, protein biosynthesis is currently assumed to be absent in these cells. Because of the lack of nuclei and organelles, mature red blood cells do not contain DNA and cannot synthesize any RNA, and consequently cannot divide and have limited repair capabilities.