alleryStart learning →Which polysaccharide forms both the arthropod exoskeleton and fungal cell walls?
AAmylose, an unbranched polymer
BChitin, a nitrogen bearing polymer
CCellulose, an unbranched polymer
DGlycogen, a branched polymer
Answer & Solution
Correct answer: B. Chitin, a nitrogen bearing polymer
1. Arthropods such as insects and crustaceans carry an outer skeleton that protects the internal body parts.
2. That exoskeleton is made of chitin, a polysaccharide that contains nitrogen.
3. Chitin is also a major component of fungal cell walls, and fungi form a kingdom of their own in the domain Eukarya.
4. Cellulose builds plant walls, not fungal ones, so it covers only half of the question.
5. Amylose and glycogen are storage polymers, so neither has a structural role of this kind.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 3 "Biological Macromolecules", section 3.2 Carbohydrates_
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