Biology 3484A/B Lecture Notes - Anoxygenic Photosynthesis, Cyanobacteria, Stromatolite
24 Dec 2012
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Historical perspective on classification of life: linnaeus to mid 1900s 2 kingdoms (plants and animals). 1969, whittaker 5 kingdoms (protista, bacteria, plants, animals, fungi). This is still used, but it is not a phylogenetic system. The three domain system proposed by woese is based on molecular (rrna) analysis. It is only based on sequence data (there were no other data sets used to support this system), but it is still preferable to the 5 kingdom system because he used cladistics. The three domains are bacteria, archaea, and eucaryota. Bacteria (also called eubacteria) and archaea are prokaryotic. Prokaryotes do not represent a phylogenetic group it is just a name to describe bacteria. Eukaryotes are everything else (ex. alveolates, radiolarian, euglenozoa, amoebae, algae, plants, slime molds, fungi, animals). Prokaryotic cells vs. eukaryotic cells: prokaryotic cells don"t have membrane bound organelles and they don"t have a nucleus (circular dna is located in a nucleoid).
