335 bytes added
, 18:20, 15 November 2008
Nicolle Rager Fuller, National Science Foundation
Wikimedia Commons http://en.wikipedia.org/wiki/Image:Ecoli_flagellum.jpg
Escherichia coli cells use long, thin structures called flagella to propel themselves. These flagella form bundles that rotate counter-clockwise, creating a torque that causes the bacterium to rotate clockwise.