Lysozyme is present in perspiration, saliva and tears .It destroys

Options

A. certain fungi
B. Most virus-infected cells
C. certain types of bacteria
D. All virus

Answer

### Step-by-Step Solution:

1. **Understanding Lysozyme**:
- Lysozyme is an enzyme that is naturally present in various bodily secretions such as perspiration (sweat), saliva, and tears.

2. **Function of Lysozyme**:
- The primary function of lysozyme is to act as an antimicrobial agent. It specifically targets the cell walls of certain bacteria.

3. **Mechanism of Action**:
- Lysozyme works by degrading the peptidoglycan layer of the bacterial cell wall. This degradation weakens the cell wall, leading to the lysis (breaking down) of the bacterial cell.

4. **Protection Provided**:
- By destroying the cell walls of bacteria, lysozyme helps to protect the body from bacterial infections. It plays a crucial role in the innate immune system.

5. **Evaluating Options**:
- The question provides several options regarding what lysozyme destroys:
- Certain fungi (incorrect)
- Most virus-infected cells (incorrect)
- Certain types of bacteria (correct)
- All viruses (incorrect)

6. **Conclusion**:
- Based on the function of lysozyme, the correct answer is that it destroys certain types of bacteria.

### Final Answer:
Lysozyme is present in perspiration, saliva, and tears, and it destroys certain types of bacteria.

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