The phase of tha cell cycle where cells remain metabolically active but usually do not proliferate is

Options

A. G_0 phase
B. M-phase
C. Quiescent phase
D. Both (1) and (3)

Answer

To solve the question, "The phase of the cell cycle where cells remain metabolically active but usually do not proliferate is," we will analyze the options provided and determine the correct answer step by step.

### Step 1: Understand the Cell Cycle Phases
The cell cycle consists of several phases, including:
- G1 phase (Gap 1)
- S phase (Synthesis)
- G2 phase (Gap 2)
- M phase (Mitosis)
- G0 phase (Quiescent phase)

### Step 2: Identify the G0 Phase
The G0 phase, also known as the quiescent phase, is a state where cells are metabolically active but do not actively divide or proliferate. Cells may enter this phase due to various environmental factors, such as nutrient deprivation.

### Step 3: Analyze Other Phases
- **M Phase**: This phase involves mitosis and cytokinesis, where the cell divides to form two identical daughter cells. During this phase, cells are actively proliferating.
- **G1 and G2 Phases**: These phases involve preparation for DNA synthesis and cell division, respectively, and cells are also actively proliferating during these phases.

### Step 4: Conclusion
Since the G0 phase is characterized by metabolic activity without proliferation, the correct answer to the question is the G0 phase.

### Final Answer
The phase of the cell cycle where cells remain metabolically active but usually do not proliferate is the **G0 phase** (Quiescent phase).

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