Mutases and epimerases are

Options

A. isomerases
B. hydrolases
C. lyases
D. ligases

Answer

To solve the question regarding mutases and epimerases, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Classification of Enzymes**: Enzymes are classified into six main groups based on the type of reaction they catalyze. These groups are:
- Hydrolases
- Oxidoreductases
- Lyases
- Transferases
- Ligases
- Isomerases

2. **Define Mutases**: Mutases are a type of enzyme that catalyze the intramolecular transfer of a functional group. This means they facilitate the rearrangement of atoms within a molecule, resulting in a structural change.

3. **Define Epimerases**: Epimerases are enzymes that catalyze the conversion of one epimer into another. Epimers are a specific type of stereoisomer that differ in configuration at only one specific carbon atom. This involves optical changes in the molecule.

4. **Identify the Commonality**: Both mutases and epimerases involve structural changes within a single molecule. They do not add or remove groups from the molecule but rather rearrange existing groups.

5. **Determine the Correct Classification**: Since both mutases and epimerases are involved in isomerization processes (changing the structure of molecules without adding or removing components), they fall under the category of isomerases.

6. **Select the Correct Answer**: Based on the definitions and classifications discussed, the correct answer to the question is that mutases and epimerases are classified as **isomerases**.

### Final Answer:
Mutases and epimerases are **isomerases**.

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