Role of enzyme in reaction

Options

A. Decrease activation energy
B. Increase activation energy
C. Inorganic catalyst
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Enzymes**: Enzymes are biological catalysts that facilitate biochemical reactions in living organisms. They are crucial for speeding up reactions that are essential for life.

2. **Activation Energy**: Every chemical reaction requires a certain amount of energy to get started, known as activation energy. This is the energy barrier that must be overcome for a reaction to proceed.

3. **Role of Enzymes**: Enzymes work by lowering the activation energy required for a reaction. They provide an alternative pathway for the reaction to occur, which requires less energy.

4. **Effect of Lowering Activation Energy**: By decreasing the activation energy, enzymes increase the rate of the reaction. This means that reactions can occur more quickly and efficiently at lower temperatures than would otherwise be possible.

5. **Evaluating the Options**:
- A. Decrease activation energy - This is correct as it describes the primary role of enzymes.
- B. Increase activation energy - This is incorrect; enzymes do not increase activation energy.
- C. Inorganic catalyst - This is incorrect; enzymes are organic (biological) catalysts, not inorganic.
- D. None of the above - This is incorrect because option A is correct.

6. **Conclusion**: The correct answer to the question regarding the role of enzymes in reactions is option A: decrease activation energy.

**Final Answer**: A. Decrease activation energy

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