IntroBio-15-Origin_of_Life

IntroBio-15-Origin_o - The Origin of Life 1 Spontaneous generation Predominant theory until late 19th century Life forms arose spontaneously from

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The Origin of Life 1
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Spontaneous generation Predominant theory until late 19 th century Life forms arose spontaneously from non-living matter 2
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Biogenesis All life arises only by the reproduction of preexisting life The process of life forms producing similar life forms 3
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If life always arises from previous life, then how could the first organisms arise? 4
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Big Bang Theory 1927 - the dominant scientific theory about the origin of the universe A huge explosion ~14 billion years ago produced the matter and energy of our universe Most of the matter was distributed in clouds of gas and dust As the universe expanded, gravitational attractions caused the dust clouds to condense into stars and planets 5
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Earth formed ~4.6 billion years ago Bacteria have been found in Australia in rocks dated to be ~ 3.5 billion years old 6
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Steps in origin of life 1. The abiotic (non-living) synthesis of organic molecules (amino acids or nucleotides) 2. Assembly of complex organic molecules from simple molecules (RNA or proteins) 3. Aggregation of complex organic molecules inside membrane-bound protocells 4. Development of information system allowing reproduction and passing of information to the descendants marking the evolution of living cells 7
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Origin of organic molecules
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This note was uploaded on 11/01/2010 for the course BIO 110 taught by Professor Drazkiewicz during the Fall '09 term at San Mateo Colleges.

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IntroBio-15-Origin_o - The Origin of Life 1 Spontaneous generation Predominant theory until late 19th century Life forms arose spontaneously from

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