Origin of Life on Earth

Origin of Life on Earth - (O 2 ). This represented an...

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Origin of Life on Earth   * Important Dates in Geological Time   4.5 billion years ago         -  Earth forms 4.0 - 3.0 billion years ago   -  * Origin of Life 3.5 billion years ago         -  Oldest prokaryotic organisms 1.5 billion years ago         -  Earliest eukaryotic organisms 0.5 billion years ago         -  Earliest animals   * How did life originate ?   1862 - Louis Pasteur (France) disproves the belief in "spontaneous generation"   1920 - Alexander Oparin (Russia) theorizes about the early atmosphere on earth during  the time when life arose. Oparin believed the early atmosphere consisted of water vapor  (H 2 O), hydrogen (H 2 ), methane (CH 4 ), and ammonia (NH 3 ), but no molecular oxygen 
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Unformatted text preview: (O 2 ). This represented an atmosphere that contained not only the four essential elements in biochemistry (carbon, nitrogen, hydrogen, and oxygen), but was also a "reducing atmosphere" that would favor the formation of more complex molecules (carbohydrates, lipids, proteins, and nucleic acids) necessary to form the first cells. 1953 - Stanley Miller (United States) performed experiments to test whether the atmospheric conditions that Oparin suggested would allow the formation of the molecules necessary to form cells. Miller discovered that Oparin's reducing atmosphere was conducive to the formation of carbohydrates, proteins, nucleic acids, and lipids....
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This note was uploaded on 11/18/2011 for the course BIOLOGY bi 101 taught by Professor - during the Fall '10 term at Montgomery.

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