Cells160-page4

Cells160-page4 - They have unique membrane lipids and rRNA....

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Cell - 4 Prokaryotic Organisms Domain and Kingdom Bacteria (Eubacteria) Cell walls contain peptidoglycan Some are autotrophs (photosynthetic or chemosynthetic), but most are heterotrophs (obtain carbon source by processing organic molecules) Include Bacteria and Cyanobacteria Probably the original organisms on earth Domain and Kingdom Archaea Diverged early in evolution, based on ribosomal RNA studies Their cell walls do not contain peptidoglycan Possess unique common DNA sequences (signature DNA)
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Unformatted text preview: They have unique membrane lipids and rRNA. Biochemical versatility in obtaining nutrients (Methanogens) Often restricted to harsh environments (Halophiles, Thermophiles) Eukaryotic Organisms (Domain Eukarya) Protista Organisms that lack "true" tissue development Have a variety of means of nutrition The unicellular Protista probably had multiple "origins" and are currently being organized into multiple Kingdoms...
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