Restriction enzyme belong to a large class of enzymes namely nucleases which are a type of

Options

A. hdrolass
B. lyases
C. ligases
D. isomerase

Answer

### Step-by-Step Solution:

1. **Understanding Restriction Enzymes**:
- Restriction enzymes are proteins that cut DNA at specific sequences. They are crucial tools in molecular biology for gene cloning and DNA manipulation.

2. **Identifying the Class of Enzymes**:
- Restriction enzymes are categorized under a larger class of enzymes known as nucleases. Nucleases are enzymes that cleave the bonds between nucleotides in nucleic acids (DNA and RNA).

3. **Defining Nucleases**:
- Nucleases can be further classified into two main types: exonucleases and endonucleases. Restriction enzymes are a type of endonuclease, as they cut within the DNA strand rather than at the ends.

4. **Understanding the Function of Nucleases**:
- Nucleases function by hydrolyzing the phosphodiester bonds between nucleotides, which is a chemical reaction that involves the addition of water (H2O).

5. **Classifying Nucleases**:
- Since nucleases cleave nucleic acids using water, they are classified as hydrolases. Hydrolases are enzymes that catalyze the hydrolysis of various bonds, including those in nucleic acids.

6. **Conclusion**:
- Therefore, the correct answer to the question is that restriction enzymes, which are nucleases, belong to the class of enzymes known as hydrolases.

### Final Answer:
Restriction enzymes belong to a large class of enzymes namely nucleases, which are a type of hydrolase.