BIOL 150 Study Guide - Electron Transport Chain, Electron Affinity, Intermembrane Space
Document Summary
An intermediate step between glycolysis and krebs (this is the 3rd fate of pyruvic acid): Pyruvate is converted to acetyl coenzyme a . 2 electrons/2 h+ are removed from pyruvate. Remember: there are two krebs cycles for every glucose. Note the decarboxylation reaction where co2 is formed . Part i: acetyl coa combines with oxaloacetate to form citric acid. Balance for krebs cycle: (2 co2 formed from conversion of pyruvate to acetyl coa) 4 (2 x 2) co2 from part ii (above) (total co2 = 6 per glucose) 6 x nadh (2 x 3 in krebs) Krebs cycle has a central role in metabolism: Acetyl coa is also breakdown product of fatty acids. Each fatty acid carbon provides more electrons for atp production than does cho carbon. It is in electron transport where most of the atp is generated. 90% of glucose energy is now tied up in nadh and fadh2.
