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Unformatted text preview: Intro to Prokaryotes Principles of Biology II Georgia Southern University LM Leege Introduction to Prokaryotes More prokaryotes in handful of dirt than humans that have ever lived Size 1-5 um, 750 um Habitat coldest, hottest, driest, most acidic, saltiest, etc can handle extreme pressure, boiling acid water, etc Important because? cant live without them! Nutrient cycles, disease, cheese, yogurt, vaccines, vitamins, warfare How long on earth? 3.8 by How long were they here on their own? (w/out eukaryotes) 3.8 by 2.1 by = 1.7 by Basic Characteristics Cell wall Gram stain - used in classification of prokaryotes Structure of gram (red/pinkish) and gram+ (purple) cells Gram + Cells Cell wall structure From outside to inside of cell: Thick layer of peptidoglycan, cell membrane Simple wall structure Gram Cells Cell wall structure From outside to inside of cell: Lipopolysaccharide, thin layer of peptidoglycan, cell membrane Extra layer of protection against defenses...
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This note was uploaded on 08/21/2008 for the course BIOL 2108 taught by Professor Leege,gleason during the Spring '08 term at Georgia Southern University .
- Spring '08