Salmonella is a prokaryotic organism that lives in raw or undercooked food. A prokaryote is an organism that has no nucleus and no membrane bound organelles. Most prokaryotes are single celled organisms. The two main prokaryotic domains are bacteria and archaea. Archaea are prokaryotes that live in all environments even the most extreme. All prokaryotes have at least a primitive cytoskeleton made up of actin, tubulin, and flagellin. Flagellin is one of the most important protein building blocks in bacteria. Not only does it make up the flagellum, but it also provides structure for chemotaxis. The main componenets of prokaryotic cells are flagellum, cell membrane, usually cell wall, cytoplasm, ribosome, and nucleoid region.