This illustration depicts a bacterium equipped with a flagellum, demonstrating the cellular structure used for motility. The bacterium is shown with a spiral filament extending from the cytoplasm, illustrating the mechanism by which it propels itself. The flagellum is primarily colored in shades of orange and green. This bacterial structure is essential for understanding microorganisms' locomotion, especially in prokaryotes such as Escherichia coli (E. coli).