web_L26_10BIO311C - BIO 311C Spring 2010 Lecture 26 Friday...

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BIO 311C Spring 2010 Lecture 26 – Friday 2 Apr. 1
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Consider three aspects of respiration: - Carbon flow - Oxidations and reductions - Energy changes Each of these aspects can be considered for respiration as a whole, and each aspect can also be considered for separate metabolic pathways of respiration. * 3
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1 of C 6 6 of C 1 * Summary of Carbon Flow in Respiration Recall that: C 6 indicates a chemical compound containing 6 carbon atoms. C 1 indicates a chemical compound containing 1 carbon atom. C 6 H 12 O 6 + 6 O 2 6 CO 2 + 6 H 2 O respiration energy respiration C 6 (a hexose) C 1 4
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Oxidation and Reduction in Respiration * Respiration shown as coupled oxidation and reduction half- reactions. Respiration, showing which reactant is oxidized and which reactant is reduced. Energy (ATP) production is not shown in this illustration. 5
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Energy Capture During Respiration Note that 1800 kJ of energy is lost as heat for every mole of glucose that is fully oxidized. Thus, 62% of the energy released during glucose oxidization is lost. This suggests that respiration is not a very efficient process. However, this heat loss (expressed as a negative Δ G° value) is what drives the process in the forward direction and allows respiration to occur at a rapid rate. * 6
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Metabolic Pathways and Processes that Participate in Respiration - Glycolysis - Pyruvate dehydrogenase - Krebs Cycle - Mitochondrial electron transport chain - Oxidative phosphorylation Occurs in the cytoplasmic matrix Occur in mitochondria of eukaryotic cells 7 *
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This note was uploaded on 06/11/2010 for the course BIO 48765 taught by Professor Sathasvian during the Spring '10 term at University of Texas at Austin.

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web_L26_10BIO311C - BIO 311C Spring 2010 Lecture 26 Friday...

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