Cellulose is formed by union of repeated residues of

Options

A. Amino acids
B. Lipids
C. Glucose
D. Fructose.

Answer

**Step-by-Step Solution:**

1. **Understanding Cellulose**: Cellulose is a complex carbohydrate, specifically a polysaccharide. It is a major component of the cell wall in plants and provides structural support.

2. **Identifying the Building Blocks**: To determine what cellulose is formed from, we need to identify its monomeric units. Monomeric units are the smaller units that combine to form a polymer.

3. **Options Analysis**: The options provided are:
- Amino acids
- Lipids
- Glucose
- Fructose

4. **Evaluating Each Option**:
- **Amino Acids**: These are the building blocks of proteins, not polysaccharides.
- **Lipids**: These are fats and oils, which are not related to cellulose.
- **Glucose**: This is a simple sugar (monosaccharide) and is known to be a key component of cellulose.
- **Fructose**: This is another type of sugar, but it does not form cellulose.

5. **Conclusion**: Cellulose is formed by the union of repeated residues of glucose. Specifically, it consists of long chains of glucose molecules linked together by beta-1,4-glycosidic bonds.

6. **Final Answer**: The correct answer is **glucose**.

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