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Lecture 6 notes 9-24

Lecture 6 notes 9-24 - Lecture 6 Cellular Respiration...

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Lecture 6 – Cellular Respiration 9-24-07 Albert Szent-Gyorgyi (Novel Prize 1937) - Identified most steps of the Krebs cycle - Isolated vitamin C - Pioneered the chemistry of muscle contraction Respiration - Releases energy in organic molecules (converts energy trapped in sugars and makes ATP, which is used throughout the cell to perform different cell functions or to do work/do uphill reactions) - Org compounds + Oxygen Carbon Dioxide + Water + Energy - C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O + Energy Oxidation-Reduction Reactions Reduction: gain of electrons (i.e. reducing the charge) Oxidation: loss of electrons (usually the thing doing the oxidizing is oxygen) Ex. Na (becomes oxidized) + Cl (becomes reduced) Na + + Cl - Ex. (more precisely): Cl 2 + 2e- 2 Cl - 2Na 2Na + + 2e - e-s cancel out - Bond rearrangement partial oxidation reduction - Ex. Methane, C partially loses its neg change (oxidized) because electrons are held fa away from it, and O partially becomes more negative by holding electrons closer to it (reduced) - C 6 H 12 O 6 + 6O 2
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