Which of the following acts as biological catalysts ?

Options

A. Lipids
B. Proteins
C. Carbohydrates
D. Nucleic acids

Answer

**Step-by-Step Solution:**

1. **Understanding Biological Catalysts:**
- Biological catalysts are substances that increase the rate of chemical reactions in living organisms without being consumed in the process. These catalysts are essential for various biochemical reactions that sustain life.

2. **Identifying Biological Catalysts:**
- The question provides four options: lipids, proteins, carbohydrates, and nucleic acids. We need to determine which of these acts as biological catalysts.

3. **Analyzing Each Option:**
- **Lipids:** These are primarily involved in energy storage and cellular structure but do not act as catalysts.
- **Proteins:** Many proteins function as enzymes, which are biological catalysts that speed up chemical reactions in the body.
- **Carbohydrates:** These are mainly energy sources and structural components, not catalysts.
- **Nucleic Acids:** These are involved in genetic information storage and transfer but do not serve as catalysts.

4. **Conclusion:**
- Among the options provided, proteins are the only substances that act as biological catalysts. Therefore, the correct answer is **proteins**.

**Final Answer:** Proteins act as biological catalysts.

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