Introductory Microbiology MMG 301
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This 1 page Study Guide was uploaded by Reed McGlynn on Saturday September 19, 2015. The Study Guide belongs to MMG 301 at Michigan State University taught by Staff in Fall. Since its upload, it has received 15 views. For similar materials see /class/207348/mmg-301-michigan-state-university in Microbiology at Michigan State University.
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Date Created: 09/19/15
MMG 301 Study Guide for Bioenergetics The energies available from balanced fermentation reactions are based on the Gibb s free energy difference AG0 that is calculated as the free energies of formation for the products minus the free energies of formation of the substrates In mathematical lingo this is AGquot G products 7 G substrates G0 values for a large number of substances are shown in your book in Table Al 1 The energies available from respiration reactions are based on the difference in reduction potentials of the electron donor minus the electron acceptor In other words AEO EO acceptor E0 donor E0 values for a large number of compounds are shown in your book in Table Al2 The values of AGO and AEO are interconverted by a simple equation AG nFAE n is the number of electrons transferred in each reaction often 2 in biology andF 9648 kJmole Thus fermentation reactions can be used to produce an electrochemical gradient or respiratory reactions can be used to synthesize desired compounds Practice questions 1 What value of AGquot do you calculate for the energy available to yeast growing by alcoholic fermentation 1 glucose converted to 2 ethanol plus 2 C02 2 What value of AGO do you calculate for heterolactic fermentation 1 glucose converted to l lactic acid 1 ethanol and 1 C02 3 What value of AGquot do you calculate for Clostridium kluyverz39 growing by the following fermentative process ethanol acetate CO converted to caproate butyrate H2 gas 4 What value of AEO do you calculate for a cell growing on H fumarate to form succinate What is this in AG0 5 What value of AEO do you calculate for a cell growing on H oxygen to form water What is this in AG 6 What value of AEO do you calculate for a cell growing on H sulfate to form hydrogen sulfide HZS What is this in AG0 Answers 1 Your calculation should be as follows keeping track of the number of moles of each substance 218175 23944 7 9172 235l all in units okamol Note that this is an negative number thus energy is available for the cells to grow
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