A pair of enzymes which catalyse the break down of bonds are

Options

A. Oxidoreductases & transferases
B. Oxidoreductases and ligases
C. Hydrolases and lyases
D. Lyases and ligases

Answer

To solve the question regarding the pair of enzymes that catalyze the breakdown of bonds, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a pair of enzymes that catalyze the breakdown of bonds. We need to identify which enzymes fit this description.

2. **Identifying the Types of Enzymes**: The options provided are:
- Oxidoreductases and Transferases
- Oxidoreductases and Ligases
- Hydrolysis and Lyases
- Lyases and Ligases

3. **Analyzing Each Option**:
- **Oxidoreductases**: These enzymes are involved in oxidation-reduction reactions, not specifically in breaking bonds.
- **Transferases**: These enzymes transfer functional groups from one molecule to another, but they do not primarily catalyze the breakdown of bonds.
- **Lyases**: These enzymes are known to catalyze the breaking of various chemical bonds by means other than hydrolysis or oxidation. They are indeed cleaving enzymes.
- **Hydrolysis**: This refers to the process of breaking bonds using water, which is also a cleaving process.

4. **Eliminating Incorrect Options**:
- Since oxidoreductases and transferases do not catalyze bond breakdown, we can eliminate the first two options.
- Ligases are known for catalyzing the joining of two molecules rather than breaking bonds, so options that include ligases can be eliminated.

5. **Identifying the Correct Pair**:
- The remaining options are "Hydrolysis and Lyases" and "Lyases and Ligases". Since ligases do not break bonds, the correct pair is "Hydrolysis and Lyases".

6. **Final Answer**: The correct answer is **Hydrolysis and Lyases**.