A non-proteinaceous enzyme is

Options

A. lysozyme
B. ribozyme
C. ligase
D. deoxyribonuclease

Answer

To answer the question "A non-proteinaceous enzyme is:", we need to analyze the options provided: lysozyme, ribosome, ligase, and deoxyribonuclease.

### 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**: The question specifically asks for a non-proteinaceous enzyme. This means we are looking for an enzyme that is not made of proteins.

3. **Analyzing the Options**:
- **Lysozyme**: This is an enzyme that breaks down bacterial cell walls and is proteinaceous in nature.
- **Ligase**: This enzyme is involved in joining DNA strands and is also proteinaceous.
- **Deoxyribonuclease**: This enzyme breaks down DNA and is proteinaceous as well.
- **Ribozyme**: This is a type of RNA molecule that can act as an enzyme. It catalyzes biochemical reactions, such as the splicing of RNA, and is non-proteinaceous.

4. **Conclusion**: Among the options provided, the only non-proteinaceous enzyme is the ribozyme.

### Final Answer:
The non-proteinaceous enzyme is **ribozyme**.

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