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Chapter 5, part B

Chapter 5, part B. Microbial Metabolism. Fermentation. Releases energy from oxidation of organic molecules Does not require oxygen Does not use the Krebs cycle or ETC Uses an organic molecule as the final electron acceptor. Fermentation. Figure 5.18b. Fermentation.

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Chapter 5, part B

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  1. Chapter 5, part B Microbial Metabolism

  2. Fermentation • Releases energy from oxidation of organic molecules • Does not require oxygen • Does not use the Krebs cycle or ETC • Uses an organic molecule as the final electron acceptor

  3. Fermentation Figure 5.18b

  4. Fermentation • Alcohol fermentation. Produces ethyl alcohol + CO2 • Lactic acid fermentation. Produces lactic acid. • Homolactic fermentation. Produces lactic acid only. • Heterolactic fermentation. Produces lactic acid and other compounds.

  5. Fermentation Figure 5.19

  6. Fermentation Figure 5.23

  7. Lipid Catabolism Figure 5.20

  8. Protein Catabolism Extracellular proteases Protein Amino acids Deamination, decarboxylation, dehydrogenation Krebs cycle Organic acid

  9. Protein Catabolism Figure 5.22

  10. Biochemical tests • Used to identify bacteria. Figure 10.8

  11. Photosynthesis • Photo: Conversion of light energy into chemical energy (ATP) • Light-dependent (light) reactions • Synthesis: Fixing carbon into organic molecules • Light-independent (dark) reaction, Calvin-Benson cycle • Oxygenic: 6 CO2 + 12 H2O + Light energy  C6H12O6 + 6 O2 + 6 H2O • Anoxygenic: CO2 + 2 H2S + Light energy  [CH2O] + 2 A + H2O

  12. Cyclic Photophosphorylation Figure 5.24a

  13. Noncyclic Photophosphorylation Figure 5.24b

  14. Figure 5.25

  15. Table 5.6

  16. Halobacterium uses bacteriorhodopsin, not chlorophyll, to generate electrons for a chemiosmotic proton pump.

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