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| organisms and acellular entities too small to be clearly seen by the unaided eye |
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| lack a nucleus; simplier; no membrane |
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based on comparison of ribosomal RNA
bacteria
archaea
eukarya |
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| single-celled, cell wall w/peptidoglycan,lack mem-bound nucleus,ubiquitous,cyanobateria |
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| unique RNA sequence, lack peptidoglycan, monolayer,unusual metabolic charac,live in extreme environments |
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| protists, larger than other 2 |
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| may be motile, "hunters, grazers" |
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| smallest of all microbes, requires host cell, causes range of diseases |
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Definition
| infectious agents composed of RNA |
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Definition
| infectious proteins, "mad cow" |
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Definition
RNA molecules that form peptide bonds
perform cellular work and replication
Tom Cech, splice itsself |
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| Last Universal Common Ancestor (LUCA) |
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the root or origin of modern life
archaea and eukarya evolved independently of bacteria and diverged from common ancestor |
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| origin of mitochondria, chloroplast, and hydrogenosomes from endosymbiont |
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| can take up DNA from environment |
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| collection of strains that share stable properties and are different from other groups of strains |
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| descendents of a single pure microbial culture |
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