Enzymes included in oxido reductases class catalyse the following reaction

Options

A. Transamination
B. Oxidation
C. Reduction
D. 2 & 3

Answer

To solve the question regarding the reactions catalyzed by enzymes included in the oxidoreductases class, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up biochemical reactions. They are primarily proteins and play a crucial role in metabolic processes.

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

3. **Focus on Oxidoreductases**: The question specifically asks about oxidoreductases. These enzymes are involved in oxidation-reduction reactions, which are fundamental processes in metabolism.

4. **Defining Oxidation and Reduction**:
- **Oxidation**: This is the process where a substance loses electrons or increases its oxidation state.
- **Reduction**: This is the process where a substance gains electrons or decreases its oxidation state.

5. **Function of Oxidoreductases**: Oxidoreductases catalyze reactions that involve the transfer of electrons between molecules, which means they facilitate both oxidation and reduction processes.

6. **Evaluating the Options**:
- Option A: Transamination - This is a reaction involving the transfer of an amino group, catalyzed by transferases, not oxidoreductases.
- Option B: Oxidation - This is only part of what oxidoreductases do.
- Option C: Reduction - This is also only part of what oxidoreductases do.
- Option D: Both Oxidation and Reduction - This accurately describes the function of oxidoreductases.

7. **Conclusion**: Based on the understanding that oxidoreductases catalyze both oxidation and reduction reactions, the correct answer is Option D.

### Final Answer:
**Option D: Both Oxidation and Reduction.**