The monosaccharide pentose sugar present in RNA is

Options

A. Galactose
B. Sucrose
C. Ribose
D. Fructose

Answer

To answer the question "The monosaccharide pentose sugar present in RNA is," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Type of Sugar**:
- The question specifies that we are looking for a monosaccharide, which is a simple sugar that cannot be broken down into simpler sugars.

2. **Understand the Classification of Sugars**:
- Sugars are classified based on the number of carbon atoms. Monosaccharides can be triose (3 carbons), tetrose (4 carbons), pentose (5 carbons), hexose (6 carbons), and heptose (7 carbons).
- Since we are looking for a pentose sugar, we focus on sugars that contain 5 carbon atoms.

3. **Identify the Pentose Sugar in RNA**:
- The pentose sugar present in RNA is specifically ribose.
- Ribose has a chemical formula of C5H10O5.

4. **Differentiate from Other Sugars**:
- It's important to note that in DNA, the sugar is deoxyribose, which has one less oxygen atom than ribose (C5H10O4). This distinction helps clarify the difference between RNA and DNA.

5. **Conclude the Answer**:
- Therefore, the monosaccharide pentose sugar present in RNA is ribose.

### Final Answer:
The monosaccharide pentose sugar present in RNA is **ribose**.

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