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all members are prokaryotic, most unicellular lack membrane bound nucleus distinguished by types of molecules that make up their plasma membranes archaea have unique phospholipids in their plasma membranes hydrocarbon tails of phospholipids are made from isoprene BIOLOGICAL IMPACT lineages in the domains of bacteria and archaea are ancient, diverse most microbes (microscopic organisms) are unnamed extremophiles - bacteria/archaea that live in extreme temperatures firmicutes- disease bacterias cyanobacteria - produces oxygen in atmosphere actinobacteria - produces antibiotics spirochaetes - syphillis, lyme disase chlamydiae proteobacteria ARCHAE KOCH’S POSTULATES used to confirm a causative link between infectious disease and a specific microbe 4 criteria 1. microbe must be present in individuals suffering from the disease and absent from healthy individuals 2. organism must be isolated and grown in a pure culture away from the host organism 3. if organisms from the pure culture are injected into a healthy experimental animal, the disease symptoms should appear 4. the organism should be isolated from the diseased experimental animal, again grown in pure culture, and demonstrated by its size, shape, and color to be the same as the original organism
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