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archaea |
Also found in: Wikipedia, Hutchinson | 0.01 sec. |
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archaea: see Archaebacteria Archaebacteria (är'kēbăktĭr`ēə) ..... Click the link for more information. . archaeaA group of prokaryotes whose members differ from bacteria, the most prominent prokaryotes, in certain physical, physiological, and genetic features. The archaea may be aquatic or terrestrial microorganisms. They exhibit a diversity of shapes, including spherical, rodlike, and spiral forms. In addition, archaea can survive in various extreme conditions, including very hot or salty environments. Some archaea require oxygen, whereas others do not. Some produce methane as an end product; others depend on sulfur for their metabolism. The archaea can reproduce by several mechanisms, including binary fission, budding, and fragmentation. While the archaea share some features with bacteria, genetic studies have indicated that archaea are more closely related to eukaryotes than to bacteria. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Bacteria and archae look very much alike and, prior to genetic sequencing, they were classified together even though their genes now tell us they are as different as elephants and pond scum--maybe more so. On the other hand, some archae seem to use both SD sequences and leaderless transcripts in their translation initiation process. |
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