lecture16 - The History of Earth and Life Lecture 16 1...

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The History of Earth and Life Lecture 16 1 Lecture 16 - Proterozoic Life Proterozoic Life The Precambrian breakthroughs in the history of life Oxygenic photosynthesis, stromatolites, and the oxygenation of the atmosphere Eukaryotes vs. Prokaryotes Origin and early fossil record of eukaryotes How to Classify Life: Three domains of life Precambrian Breakthroughs in the History of Life 1. Origin of Life (Late Hadean/Early Archean) 2. Evolution of Metabolism (Fermentation, Anoxygenic Phototrophy, Oxygenic Photosynthesis) (Archean and Earliest Proterozoic) 3. Eukaryotic Cells (Eucarya, Endosymbiosis) (Early Proterozoic) 4. Sex (Diploidy, Meiosis) (Early/Middle Proterozoic) 5. Multicellularity (Late Proterozoic) Oxygenic Photosynthesis From 3.5 to 2.3 billion years prokaryotes were the only life form on our planet Most of the major groups of prokaryotes evolved in the Archean (that is, most of the metabolic pathways evolved very early in the history of life (3.5 billion years) A methabolic pathways known as "Oxygenic Photosynthesis" has evolved in Archean times Photosynthesis Autotrophic (self feeding metabolism) metabolism Obtain energy from the sun by converting carbon dioxide and water into carbohydrates CO 2 + H
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lecture16 - The History of Earth and Life Lecture 16 1...

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