01:070:111 Lecture Notes - Lecture 12: Cyanobacteria, Alphaproteobacteria, Proterozoic
27 Mar 2018
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For quiz: the joy of sex is the speed of evolution. Characteristic present in ancestors will be present in later ones. Geologists/paleontologists use the geological time scale (for periods of time) History of time limited by the rocks. Formation of the universe: 13. 7 billion years ago (big bang) Solar system: 4. 57 billion years ago ( age of the universe) Formation of the moon: 4. 53 billion years ago. Late heavy bombardment: 4. 1-3. 8 billion years ago. Oldest datable rocks on earth: 4. 031 0. 003 billion years ago. Stromatolites created by algae growing that traps sediment. Happens in a few layers so this gives rise to 3d shape (mushroom type, curvy, coal) Represent advanced life (not simple bacteria, algae- eukaryotes) Widespread proliferation of cyanobacteria: 3 to 2. 5 billion years ago. Oxygen produced new atmosphere new niche. All the genes with archaea and bacteria are proof of eukaryotic fusion. 1st model: eukaryotes and archaea are closely related. 2nd model: eukaryote from archaea and bacteria.
