The cell size doubles in a stage of cell cycle called

Options

A. M
B. `G_(2)`
C. S
D. `G_(1)`

Answer

**Step-by-Step Solution:**

1. **Understanding the Cell Cycle:**
The cell cycle consists of several phases: G1 (first gap), S (synthesis), G2 (second gap), and M (mitosis). Each phase has distinct activities that contribute to cell growth and division.

2. **Identifying the G1 Phase:**
The G1 phase is the first phase of the cell cycle. During this phase, the cell grows and performs its normal functions. It is characterized by significant protein synthesis and organelle duplication.

3. **Cell Growth in G1 Phase:**
In the G1 phase, the cell increases in size due to the duplication of organelles and the increase in cytoplasm. This results in the overall doubling of the cell size.

4. **Distinguishing Between Phases:**
- **S Phase:** This phase is primarily focused on DNA replication, where the genetic material is duplicated, but it does not involve a doubling of cell size.
- **G2 Phase:** This phase prepares the cell for division but does not contribute to an increase in cell size.
- **M Phase:** This is the phase where cell division occurs, and the cell splits into two daughter cells.

5. **Conclusion:**
Based on the activities occurring in each phase, the cell size doubles specifically during the G1 phase of the cell cycle.

**Final Answer:**
The cell size doubles in a stage of the cell cycle called the G1 phase.

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