Which of these are polysaccharides of glucose ?

Options

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

Explanation

To determine which of the given options are polysaccharides of glucose, we need to analyze each option based on their structure and classification.

### Step-by-Step Solution:

1. **Understanding Polysaccharides**:
- Polysaccharides are carbohydrates that consist of long chains of monosaccharide units. In this case, we are specifically looking for polysaccharides made up of glucose units.

2. **Analyzing Option A: Starch**:
- Starch is a well-known polysaccharide composed of glucose units.
- It consists of two components: amylose (20% - water-soluble) and amylopectin (80% - water-insoluble).
- Amylose has 1-4 glycosidic linkages, while amylopectin has both 1-4 and 1-6 linkages, allowing for branching.
- **Conclusion**: Starch is a polysaccharide of glucose.

3. **Analyzing Option B: Cellulose**:
- Cellulose is another polysaccharide made entirely of glucose units, specifically in the form of beta-D-glucose.
- It is the most abundant carbohydrate on Earth and provides structural support in plant cell walls.
- **Conclusion**: Cellulose is also a polysaccharide of glucose.

4. **Analyzing Option C: Sucrose**:
- Sucrose is a disaccharide formed by the condensation of glucose and fructose.
- It does not consist of multiple glucose units and therefore does not qualify as a polysaccharide.
- **Conclusion**: Sucrose is not a polysaccharide of glucose.

5. **Analyzing Option D: Lactose**:
- Lactose is another disaccharide composed of glucose and galactose.
- Similar to sucrose, it does not consist of multiple glucose units.
- **Conclusion**: Lactose is not a polysaccharide of glucose.

### Final Answer:
The correct options that are polysaccharides of glucose are:
- **A. Starch**
- **B. Cellulose**