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Domain Bacteria - E coli can reproduce by binary fission...

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Domain Bacteria (Eubacteria) The old taxonomic Kingdom Monera consisted of the bacteria (meaning the true bacteria and cyanobacteria, or photosynthetic bacteria) as well as the archea. The modern classification, see Figure 1, seprates each of these groups to separate domain status. Organisms in the Domain Bacteria lack membrane-bound organelles such as the nucleus and endoplasmic reticulum that typify the third domain, the Eukaryota. All members of Domain bacteria are prokaryotes . Bacteria (technically the Eubacteria ) and blue-green bacteria (the blue-green algae when I was a student back in the 1970s), or cyanobacteria are the major forms of life in this domain, examples of which are shown in Figure 2. Their small size, ability to rapidly reproduce (for example, the intestinal bacterium
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Unformatted text preview: E. coli can reproduce by binary fission every 15 minutes), and diverse habitats/modes of existence make bacteria the most abundant and diversified group of organisms on (and under!) the Earth. Bacteria occur in almost every environment on Earth, from the bottom of the ocean floor, deep inside solid rock, to the cooling jackets of nuclear reactors. Possible bacteria-like structures have even been recovered from 3 billion year old Martian meteorites. If these turn out to be fossils (and as of 2002 it seems likely they are NOT), then the bacterial form of life would have existed simultaneously on both Earth and Mars. However, the cellular nature of the Martian structures has not been conclusively established....
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