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Exam 3 Part 3 (Got A+ on the test)

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Louisiana State University
Biological Sciences
BIOL 2051

1Chapter 17 Origins and EvolutionChapter 18 Bacterial DiversityPhylogeny study of evolutionary relationships of organismsComparison of rRNA sequences can be used to determine the evolutionary relationships among organismsSSU small subunit rRNA sequencing of 16S or 18S is commonThe Ribosomal Database Project RDP contains a large collection of rRNA sequencesPhylogenetic trees based on rRNA have been prepared for all the major prokaryotic and eukaryotic groupsComparative ribosomal RNA sequencing has defined the 3 domains of life1 BacteriaProkaryotes2 ArchaeaProkaryotes3 EukaryaCharacteristics of the Domains of LifeFeatureBacteriaArchaeaEukaryaCell wall Peptidoglycan cell wall PseudopeptidoglycanChitin PlanctomycesPirella cell wallcellulosehave protein cell wall protein cell wall protozoans lack a cellMycoplasmawallChlamydia lack cell wall Esterlinked fatty acidsEtherlinked fatty acids Esterlinked fatty acidsLipids Membrane lipid bilayermembrane lipidmembrane lipid bilayermonolayerRNA4 subunits2 different ones with3 different ones with 10polymerase810 subunits each12 subunits eachProtein 70S ribosomes formyl 70S ribosomes but80S ribosomesSynthesismethioninefunctionally similar tomethionineeukaryotes MethionineDomainPhylumClassOrderFamilyGenusSpecies16S ribosomal RNA sequence difference of less than 5 are same genusSpecies16S ribosomal RNA sequence difference of less than 4 are same species7029 prokaryotes recognized many more out thereNomenclature and Bergeys ManualBinomial system of nomenclature descriptive genus name and species epithetThe International Code of Nomenclature of Bacteria regulates naming of prokaryotesFormal recognition of a new prokaryotic species requires Deposition of a sample of the organism in 2 international culture collectionsOfficial publication of the new species name and description in International Journal of Systematic and Evolutionary Microbiology IJSEM 1 Bergeys Manual of Systematic Bacteriology and 2The Prokaryotes are major taxonomic compilations of Bacteria and Archaea
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