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When are spindle fibre proteins synthe-s...

When are spindle fibre proteins synthe-sised?

A

`G_(1)` phase

B

`G_(2)` phase

C

metaphase

D

S phase

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Spindle Fiber Proteins**: Spindle fiber proteins are crucial for the proper alignment and separation of chromosomes during cell division, specifically mitosis. 2. **Phases of the Cell Cycle**: The cell cycle consists of two main parts: Interphase and the Mitotic phase. Interphase is further divided into three phases: G1, S, and G2. 3. **G1 Phase**: During the G1 phase, the cell grows in size and prepares for DNA replication. No spindle fiber proteins are synthesized in this phase. 4. **S Phase**: In the S phase, DNA replication occurs, resulting in the formation of identical copies of DNA. However, spindle fiber proteins are not synthesized during this phase. 5. **G2 Phase**: The G2 phase follows the S phase. During this phase, the cell continues to grow and prepares for mitosis. Importantly, spindle fiber proteins are synthesized during the G2 phase. This is when the cell organizes the mitotic apparatus necessary for chromosome separation. 6. **Conclusion**: Therefore, spindle fiber proteins are synthesized during the G2 phase of interphase, which is essential for the subsequent events of mitosis. **Final Answer**: Spindle fiber proteins are synthesized during the G2 phase of interphase. ---
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