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Unformatted text preview: 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...
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