Product of an enzyme catalysed reaction can act as an inhibition of the reaction. It is

Options

A. Feedback inhibition
B. Repression
C. Non-competitive inhibition
D. Competitive inhibition.

Answer

To solve the question regarding the product of an enzyme-catalyzed reaction acting as an inhibitor, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Enzyme Inhibition**:
- Enzyme inhibition refers to the process where the activity of an enzyme is decreased or halted by a molecule. This can occur through various mechanisms.

2. **Identifying Types of Inhibition**:
- The options provided are:
- Feedback inhibition
- Repression
- Non-competitive inhibition
- Competitive inhibition

3. **Explaining Feedback Inhibition**:
- Feedback inhibition is a regulatory mechanism where the end product of a metabolic pathway inhibits an enzyme involved in its own synthesis. This prevents the overproduction of the end product.

4. **Mechanism of Feedback Inhibition**:
- When the concentration of the end product increases, it binds to the enzyme and alters its active site. This change prevents the substrate from binding, effectively stopping the reaction.

5. **Example of Feedback Inhibition**:
- A classic example is during glycolysis, where glucose is converted to glucose 6-phosphate by the enzyme hexokinase. If glucose 6-phosphate accumulates, it inhibits hexokinase, thus regulating the pathway.

6. **Conclusion**:
- Based on the explanation and examples, the correct answer to the question is **feedback inhibition**.

### Final Answer:
The product of an enzyme-catalyzed reaction that can act as an inhibitor of the reaction is **feedback inhibition**.

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