Highly extend and elaborate nucleo protein fibres in the nucleus can be seenduring ______stage of cell cycle.

Options

A. Prophase
B. Metaphase
C. Anaphase
D. Interphase

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the stage of the cell cycle during which highly extended and elaborate nucleoprotein fibers can be observed in the nucleus.

2. **Identifying Cell Cycle Stages**: The cell cycle consists of several stages: Interphase (which includes G1, S, and G2 phases), Prophase, Metaphase, Anaphase, and Telophase.

3. **Analyzing Each Stage**:
- **Prophase**: During prophase, chromatin condenses into visible chromosomes. Thus, the nucleoprotein fibers are not highly extended; they are compacted.
- **Metaphase**: In metaphase, chromosomes are aligned at the cell's equator. Again, this indicates that the chromatin is not in an extended form.
- **Anaphase**: In anaphase, the sister chromatids are pulled apart towards opposite poles of the cell. The chromatin is still not in an extended state.
- **Interphase**: During interphase, the chromatin is in a relaxed and extended form, allowing for transcription and replication processes. This is when the nucleoprotein fibers are most elaborate.

4. **Conclusion**: Based on the analysis, the stage of the cell cycle where highly extended and elaborate nucleoprotein fibers can be seen is **Interphase**.

**Final Answer**: The correct answer is **Interphase**.

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