Some mature eukaryotic cells lack nucleus but yet these cells consider as a living

Answer

**Step-by-Step Solution:**

1. **Understanding Eukaryotic Cells**: Eukaryotic cells are characterized by the presence of a nucleus and other organelles. However, some mature eukaryotic cells can lack a nucleus.

2. **Example of Mature Eukaryotic Cells Lacking Nucleus**: A prime example of this is human red blood cells (RBCs). During their maturation process, RBCs lose their nucleus.

3. **Process of Maturation**: In the immature state, RBCs possess a nucleus. As they mature, the nucleus degenerates. This degeneration is a deliberate process that occurs to enhance the cell's functionality.

4. **Reason for Nucleus Degeneration**: The primary reason for the loss of the nucleus in mature RBCs is to increase the surface area of the cell. A larger surface area allows for more efficient binding and transport of oxygen, which is the main function of RBCs.

5. **Living Status of RBCs**: Despite the absence of a nucleus, mature RBCs are still considered living cells. They perform essential functions such as gas transport and have a lifespan of about 100 to 120 days before they are replaced by new cells.

6. **Conclusion**: Therefore, the statement that some mature eukaryotic cells lack a nucleus but are still considered living is true.

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