Lecture 18 Origin of Life - The Origin of Life Life is a...

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NATS1690 - Origins 1 The Origin of Life “Life is a magnificent continuation of the physical and chemical evolution of the universe, of galaxies and stars, and of the planet Earth.” (from - Biology , Starr & Taggart, 10ed, pg. 327)
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NATS1690 - Origins 2 References These lecture notes Custom Textbook – An Introduction to Biological Evolution , 2009 Pages 95 – 104 http://biology.clc.uc.edu/courses/bio106/origins.htm Two good reviews, for those interested. . A radio program from May 14, 1999, discussing the origins of life To hear the program in the link below Click on “Listen to this program in RealAudio” http://www.sciencefriday.com/pages/1999/May/hour2_0514 How Did Life Begin? - An Interview with Andy Knoll (2004) http://www.pbs.org/wgbh/nova/origins/knoll.html
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NATS1690 - Origins 3 Cells are the smallest units of Life Cells are alive and display all the characteristics of Life The Properties of Cells = The Characteristics of Life Are highly complex and organized Have a genetic program Can reproduce Acquire and utilize energy Carry out chemical reactions Engage in mechanical activities Respond to stimuli Are capable of self-regulation Can evolve How did things go from non-living to living? How did things start to reproduce? Answer: We don’t know
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4 What Was the Initial Life Form ?? A primitive cell…. Life is thought to have begun between 3.5 and 4.0 billion years ago Evidence from physical and chemical changes Mostly, an educated guess Oldest fossils about 3.5 billion years old - Resemble bacteria – relatively complex cells Implying life (primitive cells) originated much earlier A strand of walled prokaryotic cells 3.5 billion year old fossil – embedded in rocks from western Australia Strands of modern prokaryotic cells
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NATS1690 - Origins 5 Possible chronology of life development
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NATS1690 - Origins 6 Theories on the Origin of Life 1. Life was created by the action of one or more gods Science seeks natural causes for natural phenomenon Not-testable , non-scientific cause Beyond scope of this lecture
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This note was uploaded on 11/16/2010 for the course NATURAL SC NATS 1505 taught by Professor Isley during the Spring '10 term at Columbia State Community College.

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Lecture 18 Origin of Life - The Origin of Life Life is a...

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