Question

Which of the following polysaccharide is not present in the eukaryotic plant cell wall, it is __?

• A. Chitin
• B. Hemicellulose
• C. Pectin
• D. Cellulose

Hint:

Chitin is found in fungi and arthropods, while plants rely on cellulose for the structure of their cell walls.

Answer 1

The Correct Option is A

Chitin is a polysaccharide found in the exoskeletons of arthropods and insects, as well as in fungal cell walls. However, it is not present in the cell walls of plants.

(1) Polysaccharides in Plant Cell Walls:
- The primary polysaccharides found in plant cell walls are cellulose, hemicellulose, and pectin. These compounds provide structural support and flexibility to the plant cell wall.

(2) Why Other Options Are Correct:
- Hemicellulose (Option 2) is a component of plant cell walls and works alongside cellulose to provide structural integrity.
- Pectin (Option 3) is also a major component of the plant cell wall, contributing to cell adhesion and rigidity.
- Cellulose (Option 4) is the most abundant polysaccharide in plant cell walls and forms the structural framework of the cell wall.

Conclusion: Chitin is not found in plant cell walls, whereas cellulose, pectin, and hemicellulose are essential components of the plant cell wall.