Many bacteria, for example, E. coli and B. subtilis, regulate their gene expression via a large number of distinct devices that operate on almost all conceivable biochemical levels. Why so many?
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Homeostasis, of course. Such a relatively simple life form needs as much flexibility it can muster in its complex environment ie from the macrophage to the soil.
Posted by: Stephen M. Boyle | February 13, 2009 at 12:02 PM