Which enzymes break.the bonds without hydrolysis?

Answer

### Step-by-Step Solution:

1. **Understanding Hydrolysis**:
- Hydrolysis is a chemical process where a bond is broken by the addition of water. This means that when a water molecule is added, it helps to split a compound into smaller units.

2. **Identifying Enzymes that Do Not Use Hydrolysis**:
- The question asks for enzymes that can break bonds without the involvement of water. This indicates that we are looking for enzymes that can cleave bonds through mechanisms other than hydrolysis.

3. **Class of Enzymes**:
- The class of enzymes that break bonds without hydrolysis is known as **lyases**. Lyases are enzymes that can remove groups from substrates or add groups to double bonds, but they do not require water to do so.

4. **Function of Lyases**:
- Lyases work by forming double bonds or other structures instead of breaking a bond with the addition of water. For example, they might convert a single bond into a double bond while removing a small molecule (like CO2 or NH3) from the substrate.

5. **Examples of Lyases**:
- Some examples of lyases include:
- **Aldolase**: Involved in carbohydrate metabolism.
- **Decarboxylase**: Removes a carboxyl group, often releasing CO2.

### Final Answer:
The enzymes that break bonds without hydrolysis are called **lyases**. Examples include aldolase and decarboxylase.

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