CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False colour transmission electron micrograph of Mycoplasma sp, (red particles) at the surface of an animal cell (yellow). Micoplasmas are the simplest living cells known; their DNA codes for 750 proteins considered to be the minimum for independent life. They are the smallest cellular organism known with a diameter of 0.3-0.9 microns. Some species such as Mycoplasma pneumoniae are serious pathogens, causing a pneumonia-like infection in humans. Micoplasmas differ from bacteria in that they lack a true cell wall. Reproduction is by binary fission. The brown line through the image is the boundary of the cell's nucleus. Magnification x6750 at 35mm size.
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