<prompt> Which of the following contains single flagella?Treponema PallidumEscherichia ColiVibrio choleraHeliobacter Pylori  <response>: Ans. c Vibrio choleraeRef: Microbiology by Ananthanarayan and Paniker 8th ed. 302-305 Vibrio Cholerae is the organism with a single flagellum. Bacteria with a single flagellum are called monotrichous. Lophotrichous bacteria have multiple flagella located at the same end of the the bacteria or a few sites such as Helicobacter Pylori. Endoflagella are spirochetes flagella which is not external to the bacteria but present within the cell from end to end of the cell providing rigidity to the cell and giving it the corkscrew movement.Amphitrichous bacteriaA. fecalisPeritrichous bacteriaE. ColiEndoflagellaSpirochetes 