The sequence of events by which a cell duplicates its genome , cell constituents, and finally divides into two cells is termed as a cell cycle , and which of the following is not a part of this process ?

Options

A. G 1
B. G0
C. S
D. M

Answer

To solve the question regarding which of the following is not a part of the cell cycle, we can follow these steps:

### Step 1: Understand the Cell Cycle
The cell cycle is the series of events that a cell goes through as it grows and divides. It consists of two main phases: Interphase and M phase (Mitosis).

**Hint:** Remember that the cell cycle is divided into phases, primarily Interphase and M phase.

### Step 2: Identify the Phases of Interphase
Interphase is further divided into three sub-phases:
- **G1 Phase (Gap 1)**: The cell grows and synthesizes proteins necessary for DNA replication.
- **S Phase (Synthesis)**: The cell duplicates its DNA.
- **G2 Phase (Gap 2)**: The cell prepares for mitosis by producing proteins and organelles.

**Hint:** Interphase includes G1, S, and G2 phases, all of which are essential for cell preparation before division.

### Step 3: Understand the M Phase
The M phase includes:
- **Karyokinesis**: The division of the nucleus.
- **Cytokinesis**: The division of the cytoplasm.

**Hint:** M phase is where the actual division occurs, involving karyokinesis and cytokinesis.

### Step 4: Identify the G0 Phase
The G0 phase (Gap 0) is a state where cells exit the cycle and enter a resting phase. In this phase, the cell is not actively preparing to divide and is considered quiescent.

**Hint:** G0 phase is not part of the active cell cycle; it represents a pause or resting state.

### Step 5: Analyze the Options
Given the options: G1, G0, S, and M, we can see that:
- G1, S, and M are all parts of the cell cycle.
- G0 is not a part of the active cell cycle process.

### Conclusion
The correct answer to the question is **G0 phase**, as it is not involved in the active process of the cell cycle.

**Final Answer:** G0 phase is not a part of the cell cycle.

---