Which requires lysozyme for life cycle of viruses

Options

A. Eclipse phase
B. Penetration phase
C. Adsorption phase
D. Latent phase

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which phase of the virus life cycle requires lysozyme. Lysozyme is an enzyme that breaks down bacterial cell walls.

2. **Identifying the Phases**: The life cycle of viruses includes several phases:
- **Adsorption Phase**: The virus attaches to the host cell.
- **Penetration Phase**: The virus enters the host cell.
- **Eclipse Phase**: The virus replicates its genetic material and proteins.
- **Latent Phase**: The virus is dormant until it is released.

3. **Role of Lysozyme**: Lysozyme is crucial during the penetration phase. It is located at the tip of the phage tail and helps degrade a portion of the host cell wall, allowing the viral DNA to enter the host cell.

4. **Conclusion**: Since lysozyme is required to facilitate the entry of the virus into the host cell, the correct answer to the question is the **Penetration Phase**.

### Final Answer:
The phase of the virus life cycle that requires lysozyme is the **Penetration Phase**.