Chapter 7 - Chapter 7 How cells harvest energy How do...

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Chapter 7 How cells harvest energy
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How do organisms gain energy? Autotrophs – Capable of creating their own  energy Convert sunlight   Chemical Energy Photosynthesis Follow the energy…. Heterotrophs – Must gain energy from others Break down organic compounds   Energy Cellular respiration is energy harvest
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Cellular Respiration Enzymes can break down molecules Carbohydrates and lipids Lots of C-H and C-O bonds All cell respiration = oxidation Loss of electrons All cell respiration = Dehydrogenation Loss of an electron and a proton Commonly called what???
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Testes….testes. ..one…two…three?? NAD+  Chemical cofactor Electron acceptor Reversible reactions can turn NAD+ into  NADH Gain (oxidation) of NAD+ with two electrons  and a proton Where does the other proton go??
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Respiration Where are the electrons being moved  to? Oxidation reactions   Chain of  molecules that accept loose electrons Final Electron Acceptors Aerobic Respiration – O 2 Anaerobic Respiration – Inorganic  molecule Fermentation – Organic (non O 2 ) molecule
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“Steps” in the electron  transport chain
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C 6 H 12 O 6  + 6O 2                   6CO 2   +  6H 2 O Fire and “catabolism” act simillarly G = -686kcal/mol of glucose  Fire    Energy transferred to heat Catabolism    Energy used for something  entirely different Driving ATP synthesis! Can’t give electrons directly to O
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This note was uploaded on 04/22/2008 for the course BIOL 1105 taught by Professor Jrcowles during the Fall '06 term at Virginia Tech.

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Chapter 7 - Chapter 7 How cells harvest energy How do...

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