Cellular Respiration Harvesting Chemical Energy from Organic Molecules

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  • Cellular RespirationHarvesting Chemical Energy from Organic Molecules

  • Releasing Energy From GlucoseGlucose (6C)2 X Pyruvate (3C)2 X Acetyl-CoA (2C)CytoplasmMitochondrion O2H2OEnergy Released

  • Structure of a Mitochondrion Matrix: Krebs CycleA CellOne of Its MitochondriaA CristaInner Membrane: Has Electron Transport ChainIntermembrane CompartmentabcOuter Membrane

  • Glucose Breakdown Yields EnergyC6H12O6 + 6O2 6CO2 + 6H2O + energy40% of released energy captured in ATP Involves two electron carriersNAD+ + H+ + 2 electrons NADHFAD + 2H+ + 2 electrons FADH2Electrons donated to Electron Transport Chain to produce ATP

  • GlycolysisNet gain of 2 ATPOccurs in cytoplasm under anaerobic conditions Reverse pathway can convert pyruvate glucose

  • Formation of Acetyl CoAPyruvatesAcetyl CoAOccurs in mitochondrion; Not reversible


  • Krebs Cycle: SummaryElectron Transport Chain

  • Energy Harvested from Glucose(Cytoplasm)Glucose2 NADH2 NADH6 NADH2 FADH22 Pyruvates2 CO24 CO22 ATP4 ATP(Mitochondrial Matrix)(Inner Membrane)2 ATP32 ATPElectron Transport SystemGlycolysisKrebs CycleWaterOxygen

  • Applying Your KnowledgeWhere is the Krebs cycle located?Where does glycolysis occur?Where is CO2 produced? Where is the electron transport chain located?CytoplasmMitochondrial MatrixInner Membrane of MitochondrionChoices 1 and 2 are correct.All of these are correct. 2143

  • ATP is Produced by ChemiosmosisDiffusion of hydrogen ions (H+ ) through a differentially permeable membrane, resulting in ATP productionenergy from electron transport pumps H+ to intermembrane compartment of mitochondrionH+ diffuses to matrix through pores of ATP-synthesizing enzymemovement of H+ provides energy for ATP synthesis

  • MitochondrialChemiosmosis

  • Mitochondrial Chemiosmosis

  • Mitochondrial Chemiosmosis

  • Mitochondrial Electron Transport System

  • Without Oxygen, Fermentation Occurs Traffic backed up into mitochondrion

  • Alcoholic Fermentation for YeastNAD+GlucoseGlycolysisAlcoholic FermentationNAD+NADHADPATPADPATPPyruvatesEthanolsNAD+NAD+NADH

  • Lactate Fermentation in MusclesNAD+GlucoseGlycolysisLactate FermentationNAD+NADHADPATPADPATPPyruvatesLactatesNAD+NAD+NADH

  • Applying Your KnowledgeMuscle cells produce lactate Muscle cells produce ATPYeast cells produce alcohol In the Presence of OxygenIn the Absence of OxygenEither in the presence or absence of Oxygen232

  • Energy From MacromoleculesGlucose (6C)2 X Pyruvate (3C)2 X Acetyl-CoA (2C)GlycolysisMonosaccharidesComplex CarbohydratesDisaccharides

  • Energy From MacromoleculesGlucose (6C)2 X Pyruvate (3C)2 X Acetyl-CoA (2C)GlycolysisTriglycerides

  • Energy From MacromoleculesGlucose (6C)2 X Pyruvate (3C)2 X Acetyl-CoA (2C)GlycolysisProteins

  • Applying Your KnowledgeMuscle cells use fats for energy Muscle cells use glucose or glycogen for energyIn the Presence of OxygenIn the Absence of OxygenEither in the presence or absence of Oxygen13

  • Applying Your KnowledgeBrain cells use glucose for energyBrain cells use proteins for energy In the Presence of CarbohydratesIn the Absence of CarbohydratesEither in the presence or absence of Carbohydrates23


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