Rod Bacterium with flagella and Pili. The cell swims by means of the long peritrichous flagella. Each wavy flagellum consists of three long-chain protein molecules twisted around one another, they pass through pores in the cell wall and attach to the cell membrane by hook-like structures, the numberous short pili or fimbrae are extensions of the cell protoplast. They can attach to pili from other cells for the unidirectional sexual transfer of DNA. Color enhanced TEM shadowcast. Mag 7500x.