Ch 21- The Origin and Evolutionary History of Life

Ch 21- The Origin and Evolutionary History of Life - The...

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The Origin and Evolutionary History of Life Chapter 21 Geologists believe that ancient earth provided the exact conditions necessary for chemical evolution: little or no free O2 (reducing conditions necessary to prevent oxidation of organic molecules, the building blocks of life) Presence of chemical building blocks (water, minerals, gases) Time to allow resulting accumulation and interaction and formation of organic molecules debate! (see www.sakai.rutgers.edu – resources) Early Earth Chemical Evolution Prebiotic soup hypothesis organic molecules formed near Earth’s surface in “a prebiotic soup” of inorganic building blocks. Polymerization occurred spontaneously from monomers on hot rock or clay surfaces Iron–sulfur world hypothesis Polymerization of organic molecules produced at hydrothermal vents in deep ocean floor Vents acted as producers of energy-rich food including H2S and methane Miller and Urey’s Experiment The Origin of Cells
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This note was uploaded on 02/12/2011 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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Ch 21- The Origin and Evolutionary History of Life - The...

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