20-Life - What Is Life? Astrobiology What Is Life? I am not...

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What Is Life?
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Astrobiology
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What Is Life? I am not going to answer this question. J. B. S. Haldane
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To go from a bacterium to people is less of a step than to go from a mixture of amino acids to a bacterium. — Lynn Margulis Lynn Margulis
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WHAT IS LIFE? Dorian Sagan and Lynn Margulis
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Basic Requirements for Life As We Know It on Earth
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Basic Requirements for Life As We Know It on Earth Chemical Constituents Liquid Medium for Chemical Reactions Energy Source Electron Source
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Chemical Constituents CHNOPS
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Chemical Constituents CHNOPS Carbohydrates- CHO Lipids- CHO Proteins- CHONS Nucleic Acids- CHONP
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Chemical Constituents Why CHNOPS? 42 13 Strongest Covalent Chemical Bonds Sharing 1, 2, 3, and 4 Pairs of Electrons
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Chemical Constituents Carbon Compounds —From Organic Compounds (Heterotrophic)— or From CO 2 (Autotrophic) h Carbon Dioxide
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Carbon-Based Life-Forms
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Silicon-Based Life-Forms?
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Liquid Medium for Chemical Reactions Water
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Water’s Hydrogen Bonding
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Water as Universal Solvent
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Water as a Solid (Ice) Floats in Liquid Water
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Titan Saturn’s Largest Moon Only Moon in the Solar System With an Atmosphere Artists’ Conceptions of Titan’s Surface
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Titan’s Methane-Ethane Lakes
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Artist Rendition of Titan’s Surface with Methane-Ethane Lake and Falls
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Radar Imaging of Titan’s Surface Showing Methane-Ethane Lakes
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Water
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Ammonia As a Liquid Medium For Life?
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Energy Source From Chemical Compounds (Chemotrophic) or From Light (Phototrophic) Starch
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Electron Source From Inorganic Compounds, e.g., H 2 S, Water, etc. (Lithotrophic) or From Organic Compounds (Organotrophic) Hydrogen Sulfide (H 2 S) h
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Properties of Life
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Basic Properties of Life What are life’s BASIC ATTRIBUTES ? I. METABOLISM II. GENETICALLY CONTROLLED REPRODUCTION
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This note was uploaded on 11/22/2011 for the course BIOLOGY 190a taught by Professor Staff during the Fall '11 term at UMass (Amherst).

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20-Life - What Is Life? Astrobiology What Is Life? I am not...

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