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 process is not a part of the cell cycle, we need to understand the components of the cell cycle itself. Here’s a step-by-step breakdown:

### 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 several phases that prepare the cell for division.

### Step 2: Identify the Main Phases of the Cell Cycle
The cell cycle is divided into two main parts:
1. **Interphase**: This is the preparatory phase where the cell prepares for division.
- **G1 Phase (Gap 1)**: The cell grows and synthesizes proteins.
- **S Phase (Synthesis)**: The cell duplicates its DNA.
- **G2 Phase (Gap 2)**: The cell continues to grow and prepares for mitosis.

2. **M Phase (Mitosis)**: This is the phase where the cell actually divides.

### Step 3: Analyze the Options
Now, let’s analyze the options given in the question:
- **A. G1**: This is part of interphase and is involved in cell growth.
- **B. G0**: This is a resting state where the cell is metabolically active but does not divide. It is not considered part of the active cell cycle.
- **C. S**: This is the synthesis phase where DNA is duplicated, and it is part of interphase.
- **D. M**: This is the mitotic phase where the cell divides.

### Step 4: Determine the Correct Answer
From the analysis, we can see that:
- G1, S, and M are all parts of the cell cycle.
- G0 is a quiescent state where the cell is not actively dividing and is not considered part of the cell cycle.

Thus, the correct answer is **B. G0**.