Origin of Cells

Origin of Cells - Cells Lecture objectives To describe...

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1 Cells - Lecture objectives To describe historically, competing theories for the origin of life To understand major steps in the evolution of a cell To understand the major steps in an evolving world To begin to understand how cells work? http://multimedia. mcb . harvard .edu/media.html Where did cells (life) come from? Historical Ideas: Special Creation? Spontaneous Generation? Outer Space? Abiogenesis? First life on Earth 1. How to obtain energy? Metabolism chemical vs light energy 2. How to replicate? RNA / DNA Proteins Abiogenesis: life from non-life Basic Premise: Life Evolved on Earth Organic life in stages hypothesis: 1.Abiotic Synthesis of monomers 2.Abiotic Synthesis of polymers 3.Origin of self-replicating molecules 4.Packaging into pre-cells
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2 The Early Atmosphere A Reducing Atmosphere: Things Combine with Hydrogen NH 3 H 2 S H 2 CH 4 H 2 O Today’s Atmosphere An Oxidizing Atmosphere: Things Combine with Oxygen N 2 O 2 CO 2 NO 2 H 2 O SO
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This note was uploaded on 05/23/2011 for the course BIO 101 taught by Professor Lanno during the Spring '08 term at Ohio State.

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Origin of Cells - Cells Lecture objectives To describe...

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