BIO 1130 Lecture : Proterozoic Eon lecture notes.doc

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Oxygen atmosphere makes appearance at the end of the archean eon. Anaerobic bacteria go to places where there is no oxygen (i. e. : depths of the ocean) since the world has started to become filled with oxygen. No progression beyond single-celled eukaryote organisms during the proterozoic eon. World contains aerobic bacteria, anaerobic bacteria, and single-celled eukaryote organisms. Archea are closely related to eukarya and distantly related to bacteria. May have evolved once and every organism has inherited this type of cell wall. Doesn"t tell us about the evolution of these groups. Unbranched, zig-zag pattern for fatty acid chains in eubacteria and eukarya. Branched, non-zig-zag pattern for the plasma membrane in archea. Simple chains arose first (occam"s razor- simple to complex) Eukaryotes and bacteria arose at the same time with the unique membrane system which diverged off to create the archea. This theory is inverted compared to the generally accepted theory*