A non-proteinaceous enzyme is -

Options

A. Ligase
B. Deoxyribonuclease
C. Lysozyme
D. Ribozyme

Answer

**Step-by-Step Solution:**

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in living organisms. Most enzymes are proteins, which means they are made up of amino acids.

2. **Identifying Non-Proteinaceous Enzymes**: While most enzymes are proteinaceous, there are exceptions. We need to identify an enzyme that is not made of proteins.

3. **Analyzing the Options**: The options provided include:
- Ligase
- Deoxyribonuclease
- Lysozyme
- Ribozyme

4. **Evaluating Each Option**:
- **Ligase**: This is a proteinaceous enzyme that joins two molecules together.
- **Deoxyribonuclease**: This is also a proteinaceous enzyme that cleaves DNA.
- **Lysozyme**: This is a proteinaceous enzyme found in tears and sweat that helps prevent bacterial infections.
- **Ribozyme**: This is an RNA molecule that acts as an enzyme. It is not made of proteins.

5. **Conclusion**: The only non-proteinaceous enzyme among the options is **Ribozyme**. Therefore, the correct answer is **Ribozyme**.

**Final Answer**: A non-proteinaceous enzyme is **Ribozyme**.

---