Cellulose is a protein.

Options

A. hexapolysaccharide
B. pentapolysaccharide
C. tripolysaccharide
D. none of these

Explanation

**Step-by-Step Solution:**

1. **Understanding Cellulose**:
- Cellulose is a type of carbohydrate, specifically a polysaccharide. It is composed of long chains of glucose units linked together.

2. **Defining Polysaccharides**:
- Polysaccharides are carbohydrates that consist of more than two monosaccharide units. They can be made up of many glucose molecules linked together.

3. **Identifying the Structure of Cellulose**:
- Cellulose has a linear structure formed by β(1→4) glycosidic bonds between glucose units. This structure makes cellulose rigid and insoluble in water.

4. **Distinguishing Between Cellulose and Proteins**:
- Proteins are polymers made up of amino acids linked by peptide bonds. They do not contain saccharide units like cellulose does.

5. **Analyzing the Options**:
- The question provides options: hexapolysaccharide, pentapolysaccharide, tripolysaccharide, and none of these. Since cellulose is a polysaccharide and does not fit into any of the specified categories (hexapolysaccharide, pentapolysaccharide, or tripolysaccharide), the correct answer must be "none of these."

6. **Conclusion**:
- Therefore, the correct answer is option D: None of these.