Question

Which of these has a cell wall composed of chitin?

Answer 1

Fungi have cell walls composed of chitin, which is a polymer of acetyl glucosamine units and also a component of arthropod exoskeletons.

Step-by-step explanation:

The organisms that have a cell wall composed of chitin are fungi. Chitin, a polymer of acetyl glucosamine units, provides structural strength to the cell walls of fungi. This material is also found in the exoskeletons of arthropods, including insects, crustaceans, and mollusks. It's important to note that while both fungi and these animals contain chitin, it's the fungi that specifically use chitin in their cell walls.

Similar to plants, fungal cells are enclosed in thick cell walls; however, instead of cellulose, fungi use chitin and glucan. Fungal cell walls are made rigid by these complex polysaccharides, which offer protection against desiccation and some predators. Some primitive fungi, such as those from the Phylum Chytridiomycota, are capable of producing flagella, but most members of the kingdom Fungi are nonmotile and rely on their cell wall for protection and support.

Answer 2

The organisms from the Kingdom of Fungi are the only organisms which have a cell wall composed of chitin. The Kingdom of Fungi includes mushrooms and microorganisms such as yeast and mould. Their cellular wall contains glucans and chitin, but no cellulose. Chitin is also found in the exoskeleton of arthropods and it is a chemical compound functionally similar to keratin. Chitin provides the rigidity found in the fungal cell walls.