Which of the following is not a constituent of RNA

Options

A. Ribose
B. Phosphate
C. Adenine
D. Phyridine

Answer

To determine which of the following is not a constituent of RNA, we need to analyze the components of RNA.

### Step-by-Step Solution:

1. **Identify the Components of RNA**:
RNA (Ribonucleic Acid) is made up of three main components:
- **Ribose Sugar**: This is a five-carbon sugar that is a key component of RNA.
- **Nitrogenous Bases**: The nitrogenous bases in RNA include adenine (A), guanine (G), uracil (U), and cytosine (C).
- **Phosphate Group**: This group is part of the backbone of RNA, linking the ribose sugars together.

2. **List the Given Options**:
The options provided in the question are:
- Ribose
- Phosphate
- Adenine
- Pyridine

3. **Analyze Each Option**:
- **Ribose**: This is a constituent of RNA.
- **Phosphate**: This is also a constituent of RNA.
- **Adenine**: This is one of the nitrogenous bases found in RNA.
- **Pyridine**: This is not a component of RNA. Pyridine is a heterocyclic aromatic organic compound, which is not found in RNA.

4. **Conclusion**:
Based on the analysis, the option that is not a constituent of RNA is **Pyridine**.

### Final Answer:
The correct answer is **Pyridine**.

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