Cellulose is the major component of cell walls of

Options

A. Saccharomyces
B. Pythium
C. Xanthomonas
D. Pseudomonas

Answer

To answer the question, "Cellulose is the major component of cell walls of which organism?" we will analyze the options provided: Saccharomyces, Pythium, Xanthomonas, and Pseudomonas.

### Step-by-Step Solution:

1. **Understanding Cellulose in Cell Walls**:
- Cellulose is a polysaccharide that is primarily found in the cell walls of plants and some algae. It provides structural support.

2. **Analyzing the Options**:
- **Saccharomyces**: This is a genus of yeast. Yeasts typically have cell walls made of glucan and mannan, not cellulose.
- **Pythium**: This is a genus of water molds (oomycetes). They do not have cellulose in their cell walls; instead, their cell walls are primarily made of cellulose-like materials and other polysaccharides.
- **Xanthomonas**: This is a genus of bacteria. Bacterial cell walls are primarily composed of peptidoglycan, not cellulose.
- **Pseudomonas**: Similar to Xanthomonas, this is also a genus of bacteria with peptidoglycan in their cell walls.

3. **Identifying the Correct Answer**:
- Based on the analysis, the organism that is most commonly associated with cellulose in its cell wall is **Pythium**. Though it is not a typical plant cell wall, it has cellulose-like components.

4. **Conclusion**:
- Therefore, the correct answer to the question is **Pythium**.

### Final Answer:
**Pythium** is the organism where cellulose is a major component of its cell wall.

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