ARCHAEA - CLASSIFICATION OF ORGANISMS Living organisms are...

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ARCHAEA More about this domain---these are the strange, unusual bacteria which have also been called  archaeobacteria. Although their appearance through a microscope or as visible colonies may be  very similar or identical to other bacteria, they have some differences which put them in a group  apart: 1. Differences in structure of membrane lipids 2. Differences in RNA 3. Cell wall structure (NO peptidoglycan) 4. Unusual metabolic processes-----the ability to metabolize unusual substrates and the  production of unusual end products 5. Ability to thrive in extreme physical conditions The archaea are placed in three groups: 1. Methanogens---strict anaerobes that produce methane (CH 4 ) from carbon dioxide and  hydrogen 2. Extreme halophiles---require very high concentrations of salt 3. Hyperthermophiles----grow well in hot, acid environments
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Unformatted text preview: CLASSIFICATION OF ORGANISMS Living organisms are grouped according to similarities. Each organism is assigned a scientific name. TAXONOMIC HIERARCHY This is the complete list of taxa (classification groups) which are used to classify living organisms: Domain (this is a relatively new one) Kingdom Phylum Division (this one may be used in place of phylum in botany) Class Order Family Genus Species Organisms are grouped according to common properties (characteristics) and an estimate as to how closely related they are to a common ancestor. Some classifications are at least partly based on fossils, but this type of material is available mostly for the larger eukaryocytes. Microbes leave very few fossils, so other evidence often must be used for them....
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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ARCHAEA - CLASSIFICATION OF ORGANISMS Living organisms are...

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