BIOS41_Lecture18_03102008

BIOS41_Lecture18_03102008 -...

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BIOS 41 Biology Core I: Cellular and Molecular Spring 2008 Professor J. A. Sands Lecture 18, March 10 Thermodynamics and Cellular Bioenergetics (Chapter 3)
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03_03_Catabolic anabolic.jpg Catabolic and anabolic pathways together constitute the cell’s metabolism.
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03_06_Second law of thermo.jpg Three ways of stating the second law of thermodynamics. “In any isolated system, the degree of disorder (entropy) can only increase.” “Systems will change spontaneously toward those arrangements that have the greatest probability”. “Systems will change spontaneously toward arrangements with greater entropy.” Living systems do not defy the second law of thermodynamics.
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03_10_Complement process.jpg Photosynthesis and cellular respiration are complementary processes in the living world. Earliest life; no photosynthesis nor respiration.
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Unformatted text preview: >>>> Evolution of photosynthesis >>>> Evolution of respiration. 03_11_Carbon atoms cycle.jpg Carbon atoms cycle continuously through the biosphere. 03_12_Oxidation reduction.jpg Oxidation and reduction involve a shift in the balance of electrons. With each step, electrons are shifted away from the carbon atom. 03_13_activation energy.jpg Enzymes lower the barriers that block chemical reactions. 03_17_Negative positiveDG.jpg The free energy change for a reaction determines whether it can occur spontaneously. 03_18_Reaction coupling.jpg Reaction coupling can drive an otherwise unfavorable reaction. 03_22_chemical siphon.jpg For sequential reactions, the changes in free energy are additive. An energetically unfavorable reaction can be driven by a second reaction, which acts as a chemical siphon....
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BIOS41_Lecture18_03102008 -...

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