09_lecture - Chapter 9 Introduction to Metabolism 1...

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Chapter 9 Introduction to  Metabolism 1
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metabolism is the total of all chemical reactions  in the cell and is divided into two parts catabolism anabolism 2 Microbial Metabolism and Its  Importance
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3 Figure 9.1
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fueling reactions energy-conserving reactions  provide ready source or reducing power  (electrons) generate precursors for biosynthesis 4 Catabolism
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the synthesis of complex organic molecules  from simpler ones requires energy from fueling reactions 5 Anabolism
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chemical work  synthesis of complex molecules transport work  take up of nutrients, elimination of wastes,  and maintenance of ion balances mechanical work  cell motility and movement of structures  within cells 6 Microbial Cells Must Do Work
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7 Adenosine 5’-triphosphate (ATP) Energy Currency of the Cell
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Role of ATP in Metabolism high energy molecule  exergonic breakdown of ATP is coupled with  endergonic reactions to make them more favorable ATP +H2O                     ADP + Pi + H+ D Go´ = - 7.3 kcal/mol  guanosine 5 - triphosphate, cytosine  5 - triphosphate  ˈ ˈ and uridine 5 - triphosphate also supply some energy ˈ 8
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9 Figure 9.5
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many metabolic processes involve oxidation- reduction reactions (electron transfers) electron carriers are often used to transfer  electrons from an electron donor to an electron  acceptor 10 Oxidation-Reduction Reactions
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transfer of electrons from a donor to an  acceptor can result in energy release, which can be conserved  and used to form ATP the more electrons a molecule has, the more energy  rich it is 11 Oxidation-Reduction (Redox)  Reactions
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one is electron donating (oxidizing  reaction) one is electron accepting reaction  (reducing reaction) acceptor and donor are conjugate redox  pair acceptor + n e -                       donor 12 Redox: Two Half Reactions
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equilibrium constant for an oxidation- reduction reaction a measure of the tendency of the reducing  agent to lose electrons more negative E0   better electron donor more positive E0   better electron acceptor 13 Standard Redox Potential ( E0)
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14 The greater the difference  between the E0 of the donor and the E0 of the  acceptor the more negative the D Go´  Figure 9.7
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electron carriers organized into ETC with the  first electron carrier having the most negative  E’o as a result the potential energy stored in first redox  couple is released and used to form ATP first carrier is reduced and electrons moved to the  next carrier and so on 15 Electron Transport Chain (ETC)
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16 Figure 9.8
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located in plasma membranes of 
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This note was uploaded on 02/04/2012 for the course BIO 326R taught by Professor Whiteley during the Spring '08 term at University of Texas at Austin.

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09_lecture - Chapter 9 Introduction to Metabolism 1...

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