BIO 122 Lecture Notes - Lecture 7: Cambrian Explosion, Cyanobacteria, Peptidoglycan
2 Mar 2016
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23. 1 the fossil record documents life history: macroevolution- descent with modification that occurs above the level of species. 95% of species living massive volcanic eruptions in siberia: mesozoic era first dinosaurs, first mammals, first angiosperms. 24 early life and the diversification of prokaryoyes: earth was formed 4. 6 bya, prokaryotes are the oldest fossil organisms back to 3. 5 by a, prokaryotes are single celled organisms in the domain bacteria and archaea. Vesicles of protocells could have rna capable of replication. Rna could have provided the template for dna which allows for more stable genetic material: fossil evidence of early life: the oldest rock formed was stromatolites. Cyanobacteria formed these stromatolites, they at one point in time were the main photosynthetic organisms, early cyanobacteria began to release oxygen into earths atmosphere, surviving prokaryotes would either adapt or avoid the newly aerobic environment.
