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Terminal electron Glucose Terminal Inorganic Terminal Energy electron energy electron as an acceptors energy source аcceptors acceptors sources sources Energy released Organic carbon Organic carbon Glucose H2 -------> H2 H2S compounds compounds CO2 H2S, CO2 so SO4 Pyruvate ------------ FEOOH Fe2+ Fe2+ NHẠ NO, (to form NH,*) NO3- (to form NH,*) NO3 (to form NH,*) Mn2+ MnO2 NO3 (to form N2) (a) Energy is released when electrons are moved from an energy source with a (b) Three examples of low affinity for electrons to a terminal electron acceptor with a higher affinity. (c) Three examples of chemolithotrophic metabolism chemoorganotrophic FIGURE 6.7 Chemical Energy Sources and Terminal Electron Acceptors Catabolic pathways can proceed as long as the energy source has a lower electron affinity than the terminal electron acceptor. As a group, bacteria and archaea use a wide variety of energy sources and terminal electron acceptors, which is why the organisms are so important ecoloaicallv Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons

Terminal electron Glucose Terminal Inorganic Terminal Energy electron energy electron as an acceptors energy source аcceptors acceptors sources sources Energy released Organic carbon Organic carbon Glucose H2 -------> H2 H2S compounds compounds CO2 H2S, CO2 so SO4 Pyruvate ------------ FEOOH Fe2+ Fe2+ NHẠ NO, (to form NH,*) NO3- (to form NH,*) NO3 (to form NH,*) Mn2+ MnO2 NO3 (to form N2) (a) Energy is released when electrons are moved from an energy source with a (b) Three examples of low affinity for electrons to a terminal electron acceptor with a higher affinity. (c) Three examples of chemolithotrophic metabolism chemoorganotrophic FIGURE 6.7 Chemical Energy Sources and Terminal Electron Acceptors Catabolic pathways can proceed as long as the energy source has a lower electron affinity than the terminal electron acceptor. As a group, bacteria and archaea use a wide variety of energy sources and terminal electron acceptors, which is why the organisms are so important ecoloaicallv Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Which energy source, Fe2+ or H2S, would result in the greatest energy yield when O2 is used as a terminal electron acceptor (hint: refer to figure 6.7)?

Terminal electron Glucose Terminal Inorganic Terminal Energy electron energy electron as an acceptors energy source аcceptors acceptors sources sources Energy released Organic carbon Organic carbon Glucose H2 -------> H2 H2S compounds compounds CO2 H2S, CO2 so SO4 Pyruvate ------------ FEOOH Fe2+ Fe2+ NHẠ NO, (to form NH,*) NO3- (to form NH,*) NO3 (to form NH,*) Mn2+ MnO2 NO3 (to form N2) (a) Energy is released when electrons are moved from an energy source with a (b) Three examples of low affinity for electrons to a terminal electron acceptor with a higher affinity. (c) Three examples of chemolithotrophic metabolism chemoorganotrophic FIGURE 6.7 Chemical Energy Sources and Terminal Electron Acceptors Catabolic pathways can proceed as long as the energy source has a lower electron affinity than the terminal electron acceptor. As a group, bacteria and archaea use a wide variety of energy sources and terminal electron acceptors, which is why the organisms are so important ecoloaicallv Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons
Transcribed Image Text:Terminal electron Glucose Terminal Inorganic Terminal Energy electron energy electron as an acceptors energy source аcceptors acceptors sources sources Energy released Organic carbon Organic carbon Glucose H2 -------> H2 H2S compounds compounds CO2 H2S, CO2 so SO4 Pyruvate ------------ FEOOH Fe2+ Fe2+ NHẠ NO, (to form NH,*) NO3- (to form NH,*) NO3 (to form NH,*) Mn2+ MnO2 NO3 (to form N2) (a) Energy is released when electrons are moved from an energy source with a (b) Three examples of low affinity for electrons to a terminal electron acceptor with a higher affinity. (c) Three examples of chemolithotrophic metabolism chemoorganotrophic FIGURE 6.7 Chemical Energy Sources and Terminal Electron Acceptors Catabolic pathways can proceed as long as the energy source has a lower electron affinity than the terminal electron acceptor. As a group, bacteria and archaea use a wide variety of energy sources and terminal electron acceptors, which is why the organisms are so important ecoloaicallv Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons Relative tendency to give up electrons
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