BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
E.coli undergoing division. Coloured Transmission Electron Micrograph (TEM) of the bacterium Escherichia coli, during binary fission. Fission is the process by which a bacterium divides into two. The elongated cell (at centre) is undergoing fission, in which its red coloured DNA has divided and moved to opposite poles of the cell. A cell wall will develop to divide this cell into two daughter cells. Other bacteria are seen in cross- section. Escherichia coli is a Gram-negative, rod-shaped bacillus bacteria. It is a normal inhabitant of the human intestine, but may cause intestinal infections. It is the bacteria most commonly used in genetic engineering research.
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