Chitin is found in ______.

• A. Plant cells
• B. Bacteria
• C. Fungi, insects and exoskeletons
• D. Animal muscle tissue

Answer: (C)

Chitin is a tough, nitrogen-containing polysaccharide that serves as a structural material in certain organisms. It forms the cell walls of fungi and the exoskeletons of many arthropods, including insects and crustaceans, providing rigidity and protection. Plants use cellulose in their cell walls, bacteria have peptidoglycan, and animal tissues are made of proteins rather than chitin. So the description that best matches where chitin is found is fungi, insects and exoskeletons.