Choose the correct statement about an enzyme catalysed reaction

Options

A. Enzymes enhance the rate of reaction by increasing activation energy of the substrate
B. The difference between average energy and transition energy of substrate is called activation energy
C. Heating is required for an exothermic reaction
D. Substrate should reach transition energy state only in endothermic reactions .

Answer

To answer the question "Choose the correct statement about an enzyme catalysed reaction," we will analyze the information provided in the video transcript step by step.

### Step-by-Step Solution:

1. **Understanding Enzyme Function**: Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to occur.

2. **Graph Representation**: The video mentions a graph plotting energy against the progress of the reaction. This graph typically shows the energy levels of reactants, products, and the transition state.

3. **Activation Energy**: The activation energy is the energy barrier that must be overcome for a reaction to proceed. The video indicates that there is a difference in energy levels that represents this activation energy.

4. **Role of Enzymes**: Enzymes provide an alternative pathway for the reaction with a lower activation energy compared to the uncatalyzed reaction. This means that the presence of an enzyme allows the reaction to occur more easily and quickly.

5. **Conclusion**: Based on the information provided, the correct statement about an enzyme-catalyzed reaction is that enzymes lower the activation energy required for the reaction, facilitating the formation of products.

### Final Answer:
The correct statement about an enzyme-catalyzed reaction is that enzymes lower the activation energy needed to form stable products.