Which polysaccharide forms the exoskeleton of insects and the cell walls of fungi?
- A. Cellulose
- B. Glycogen
- C. Pectin
- D. Chitin
Explanation
Chitin is a tough nitrogen-containing polysaccharide that builds arthropod exoskeletons and fungal walls. Cellulose is the structural polymer of plant walls, and glycogen is an animal storage polysaccharide, so each structural role maps to its own polysaccharide.
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