which is not a polysaccharide ?

Options

A. Sucrose
B. Starch
C. Glycogen
D. Cellulose

Answer

To determine which option is not a polysaccharide, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Polysaccharides**:
- Polysaccharides are carbohydrates that consist of long chains of monosaccharide units linked together by glycosidic bonds. They are typically formed by the polymerization of more than two monosaccharides.

2. **Analyzing the Options**:
- **Option 1: Sucrose**
- Sucrose is a disaccharide, which means it is composed of two monosaccharides: glucose and fructose. Therefore, it does not qualify as a polysaccharide.

- **Option 2: Starch**
- Starch is a polysaccharide made up of numerous glucose units linked together. It serves as a storage form of energy in plants.

- **Option 3: Glycogen**
- Glycogen is also a polysaccharide. It is the storage form of glucose in animals and is composed of many glucose units linked together.

- **Option 4: Cellulose**
- Cellulose is a polysaccharide made of long chains of beta-glucose units. It is the most abundant organic polymer on Earth and provides structural support in plant cell walls.

3. **Conclusion**:
- Based on the analysis, the only option that is not a polysaccharide is **sucrose**.

### Final Answer:
**Sucrose is not a polysaccharide.**

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