BIOL 215 Lecture Notes - Lecture 3: Railways Act 1921, Proteobacteria, Maximum Likelihood Estimation
25 Jan 2018
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10:15 am: read chapters 8 and 9 for this lecture, overview, based on fossil record, prokaryotic cells: 3. 5-3. 8 bya, 2 billion years later (2. 5-2. 8) - some diversified into eukaryotic, **one of most important events in history of life. Fascinating finds: methane: (evidence, 1st clue of when they first appeared, to their likely metabolic pathways, released methane gas into the atmosphere. Stromatolites: the release of calcium carbonate: creates cool fossil formations. Cyanobacteria and stromatolites (archean, from 3. 8-2. 5 bya) Earth"s atmosphere(s) and the first cells/organisms: primary atmosphere: helium and hydrogen, no oxygen at all. Much of this accumulation of oxygen to current levels (21%) is considered to be a consequences of the metabolic activity of newly evolving life. Graph: dips = mass extinction, peak at 300 = flowering plants appear. In 2 groups of protists, we can still see the evidence of a second endosymbiotic event. The nucleomorph: remnant of the nucleus of the endosymbiont in the chloroplast.
