bio lecture 2 new - Lecture 2 The origins of life II I. The...

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Lecture 2 – The origins of life II I. The Oxygen Revolution A. Stromatolites create an oxygen rich atmosphere Stromatolites changed the world, at the time world still had a reducing atmosphere 1. Oxygen toxic to most existing prokaryotes At the time there was a lot of Iron in the Ocean and oxygen in the atmosphere, the Iron Oxidixed because of the oxygen and once there was no more Iron. O 2 seeped into the ocean II. From Prokaryote to Eukaryote -Created a new ecological niche, the consumer (heterotrophs) cells w/o organelles and cells w/ organelles, organelles adjust well to what they eat thus creating a mitochondria etc. -Anarobic metabolism produces 2 ATP -Aerobiotic metabolism produces 38 ATP A. The Endosymbiotic model (Lynn Margulis) Fig. 25.9 a. Evidence for the endosymbiotic model Organelle biochemistry homologous to living prokaryotes Organelle replicates by binary fission as do prokaryotes Organelles have their own DNA III. The domains of life established Bacteria Eucarya
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bio lecture 2 new - Lecture 2 The origins of life II I. The...

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