Lecture 003 Summary

Lecture 003 Summary - Lecture 003 The Origins of Life Of...

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Lecture 003 – The Origins of Life Of the 4.6 billion years that the Earth has existed, human beings only came into existence very recently. Life of the earliest kind, prokaryotes, appeared only 3.8 billion years ago. Panspermia: life came from outer space, galaxy full of “seeds” of life, landed on earth. Extremophiles: organisms that live in extreme conditions (high heat, high pressure, no light, extreme pH levels. ..). Things necessary in order for early life to begin: 1. Abiotic synthesis: being able to make important molecules without biology. 2. Heritable information: to pass down information down generations. 3. Formation of cells: to keep environment isolated away Before life, Earth contained H 2 O, H 2 , CH 4 , NH 3 , and H 2 S in its reducing atmosphere. High energy was in abundance (UV light and lightning). These factors made it possible to build up highly reduced molecules, as demonstrated in the famous Miller-Urey experiment. This is not possible in
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This note was uploaded on 04/04/2009 for the course BIOLOGY 1222 taught by Professor Haffie during the Spring '09 term at UWO.

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