Monera2 - classified into four groups: methanogens,...

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Monera Archaebacteria The name "archaebacteria," with its prefix meaning "ancient," suggests that this is an extremely old group. The fact that most of these Monerans live in extremely hostile environments similar to those found on primitive Earth leads many to believe that archaebacteria may have been the earliest forms of life on the planet. However, as a separate phylogenetic group, the Archeabacteria are actually younger than the Eubacteria, sharing a much more recent common ancestor with eukaryotes than eubacteria do. Diversity of Archaebacteria While some archaebacteria are heterotrophic, the vast majority are chemoautotrophs, meaning they produce their own food from chemicals found in their environments. Based on the method by which they do this and the type of environment in which they are found, archaebacteria can be
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Unformatted text preview: classified into four groups: methanogens, halophiles, sulfur reducers, and thermoacidophiles. Methanogens Methanogens are anaerobic, feeding on decaying plant and other organic material, producing water and methane gas. They can be found in bogs and marshes, deep in the oceans, and in the gastrointestinal tracks of cellulose- fermenting herbivores where they aid in the digestion of cellulose. Some methanogens thrive near volcanic vents. The ability of these archaebacteria to survive near such vents greatly interests scientistst, since the water in these areas reaches temperatures of up to 110 degrees Celsius. Most organisms are not able to endure these conditions: their proteins lose shape and cease to function at around 45 degrees Celsius. How methanogens have adapted to this extreme heat is not known....
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This note was uploaded on 01/27/2012 for the course BIOLOGY BSC1005 taught by Professor Rodriguez during the Winter '09 term at Broward College.

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