lec3 - Lecture 3: Origins of Life 4.6 billion years...

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Unformatted text preview: Lecture 3: Origins of Life 4.6 billion years condensed into one. Bio1222 January 1: (4,600 mya)! March 2: (3,800 mya) (600 mya) October 15 One year April 28: (2,700 mya) (1,400 mya) August 12 ! June 13: (2,200 mya) Life developed early Bio1222 Stromatolites Stages of prebiotic evolution •" So what do you need? Bio1222 Geophysical Stage Chemical Stage Biological Stage Geophysical stage Bio1222 •" What were conditions like on the young (primordial) Earth? Chemical stage •" Can one make organic molecules from inorganic molecules? Bio1222 •" Is abiotic synthesis possible today? Miller - Urey experiment! Chirality Bio1222 COOH COOH D - alanine NH2 CH3 L - alanine H CH3 H H2N Thalidomide D - glucose L - glucose Origin of homochirality •" Homochirality Bio1222 •" How did it come about? Mirchison meteorite Biological stage •" How to make polymers (DNA, RNA, proteins)? Bio1222 •" Evolution of information molecules Enter the RNA world •" RNA: Information, structure, & catalyst. Bio1222 Ribozymes •" Ribozyme Bio1222 •" Thomas Cech - Nobel Prize (1989) Evolution of information transfer Bio1222 First cells - protobionts Bio1222 ...
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lec3 - Lecture 3: Origins of Life 4.6 billion years...

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