A bacterium (plural: bacteria) is an organism belonging to the domain bacteria, in the three domain scheme. Traditionally classified as one of the five kingdoms, bacteria are microscopic, mostly single celled and their cell structure is relatively simple. Since they lack the nucleus and organelles of the more complex cells called "eukaryotes", bacteria are considered to be "prokaryotes."
For more information, please see the main article about Bacteria.
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Last updated: 02-09-2005 21:33:28
Last updated: 05-03-2005 02:30:17