Which of the following is not a monosaccharide?

Options

A. Glucose
B. Fructose
C. Cellulose
D. Ribose

Answer

To determine which of the following is not a monosaccharide, we first need to understand what a monosaccharide is.

### Step-by-Step Solution:

1. **Definition of Monosaccharides**:
- Monosaccharides are the simplest form of carbohydrates. They cannot be hydrolyzed into smaller carbohydrate molecules.

2. **General Formula**:
- The general formula for monosaccharides is \( C_n(H_2O)_n \), where \( n \) typically ranges from 3 to 7.

3. **Examples of Monosaccharides**:
- **Glucose**: Its chemical formula is \( C_6H_{12}O_6 \).
- **Fructose**: It also has the formula \( C_6H_{12}O_6 \).
- **Ribose**: The formula for ribose is \( C_5H_{10}O_5 \).

4. **Identifying Non-Monosaccharide**:
- **Cellulose**: Unlike the above examples, cellulose is a polysaccharide. It is made up of many monosaccharide units (specifically glucose units) linked together. The general formula for cellulose can be represented as \( (C_6H_{10}O_5)_n \), where \( n \) can range from 100 to 3000, indicating that it consists of many repeating units.

5. **Conclusion**:
- Since cellulose is a polysaccharide and not a single monosaccharide, the answer to the question "Which of the following is not a monosaccharide?" is **cellulose**.

### Final Answer:
**Cellulose is not a monosaccharide.**