Mature mammalian red blood cells do not have
Correct answer: A. Nucleus
- A. Nucleus
- B. Red color
- C. Fluids
- D. Haemoglobin
Explanation
Mature mammalian red blood cells, also known as erythrocytes, lack a nucleus. During their development in the bone marrow, erythrocytes have a nucleus, but they extrude it before entering the bloodstream. This allows them to have more space to carry the oxygen-carrying protein, hemoglobin. Without a nucleus, erythrocytes have a biconcave shape, which increases their surface area and allows for more efficient oxygen exchange. The lack of a nucleus also means that erythrocytes cannot divide or repair themselves, which is why their lifespan is typically around 120 days.
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