Reactive group of RNA is

Options

A. Phoshate
B. Pentose
C. 2.-OH group
D. Nitrogen base

Answer

To determine the reactive group of RNA, let's analyze the components of RNA step by step.

### Step-by-Step Solution:

1. **Identify the Components of RNA**:
RNA is composed of three main components:
- Nitrogenous bases (adenine, guanine, cytosine, and uracil)
- Ribose sugar (a pentose sugar)
- Phosphate group

2. **Examine the Nitrogenous Bases**:
The nitrogenous bases in RNA include adenine, guanine, cytosine, and uracil. These bases are crucial for the coding and decoding of genetic information but are not the reactive groups themselves.

3. **Analyze the Sugar Component**:
The sugar in RNA is ribose, which is a pentose sugar. While it plays a structural role, it is not considered a reactive group.

4. **Consider the Phosphate Group**:
The phosphate group is a component of RNA, similar to DNA. However, it is not the most reactive part of the RNA molecule.

5. **Focus on the 2'-Hydroxyl Group**:
The most significant reactive group in RNA is the 2'-hydroxyl group present on the ribose sugar. This hydroxyl group makes RNA more susceptible to hydrolysis, contributing to its reactivity and instability compared to DNA.

6. **Conclusion**:
Therefore, the reactive group of RNA is the **2'-hydroxyl group**.

### Final Answer:
The reactive group of RNA is the **2'-hydroxyl group**.