Metabolism Notes

Metabolism Notes - Metabolism- sum of al reactions both...

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1. Metabolism - sum of al reactions both catabolic and anabolic 2. Catabolic- energy producing 3. Anabolic- biosynthetic (energy-using) 4. Oxidation-Reduction reactions ( Redox) o Oxidation- loss of electrons o Reduction- gains electrons o Redox reactions are coupled Electron reaction donor gives electrons to acceptor Donor is oxidized and acceptor is reduced o Example: (5-8) 5. Electron carriers o Help transfer electrons from donor to acceptor o Membrane-bound (cytochrome c) o Freely diffusible (NAD + /NADH) (5-11) 6. Energy is released from redox reactions 7. Energy is storied in molecules and transported where needed 8. Energy storage components o Short term Adenosine triphosphate ( ATP) (5-12) 2 phosphoanhydride bonds (2 high energy phosphate bonds) Primary energy carrier in the cell Derivatives of coenzyme A- thioester bonds o Long term Glycogen Poly-B-hydrokybutyrate (4-40) 9. Catabolism- energy producing
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o Energy and electrons Chemoorganotroph Source: organic compounds Process: fermentation, aerobic respiration, or anaerobic respiration Chemolithotroph Source: inorganic compound Process: anaerobic respiration Aerobic respiration O2 Anaerobic respiration NO3, SO4 or other non-oxygen molecule o Glycolosis (5-14: yellow is glucose, pink is fermentation) Major pathway of glucose metabolism 2 ATP and 2 pyruvate generated per glucose An anoxic process Occurs in the cytoplasm o Fermentation vs respiration Both use energy released from redox reactions to make ATP Electron acceptor present: respiration No exogenous electron acceptor: fermentation Anaerobic means of generating ATP Organism compounds serve as electron acceptors and donors Substrate-level phosphorylation Phosphate group on energy rich organic intermediate is transferred directly to ADP to produce ATP Anaerobic breakdown of various fermentable substances (17-50) A variety of fermentations are known (table 17.7) Some anaerobic eukaryotes have hydrgenosomes that oxidize pyruvate to ultimately generate ATP (14-4b) Substrate level phosphorylation generates ATP Oxidative phosphorylation generates ATP No electron transport system Uses electron transport system No proton motive force To create proton motive force No ATPase Drives ATPase to synthesize ATP 2 ATP per glucose
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This note was uploaded on 03/30/2008 for the course BIOL 2051 taught by Professor Brininstool during the Fall '07 term at LSU.

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Metabolism Notes - Metabolism- sum of al reactions both...

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