CHAPTER 7: CELLULAR RESPIRATION. CELLULAR RESPIRATION Process where cells make ATP by breaking down glucose.

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  • CHAPTER 7: CELLULAR RESPIRATION

  • CELLULAR RESPIRATIONProcess where cells make ATP by breaking down glucose

  • CELLULAR RESPIRATIONProcess where cells make ATP by breaking down glucoseAutotrophs and heterotrophs both undergo respiration Occurs in the cytoplasm and mitochondria

  • CELLULAR RESPIRATIONOverall equation:C6H12O6 + 6O2 6CO2 + 6 H2O + ATP

    How is this equation different from photosynthesis?

  • WHATS SO GREAT ABOUT ATP?Every time you move a muscle, think, breathe, replicate your DNA, every time your heart beats - you use ATP to do this work!

  • TWO PATHWAYS EXIST FOR ACCESSING STORED ENERGY Aerobic Pathways take place in the presence of oxygen

  • TWO PATHWAYS EXIST FOR ACCESSING STORED ENERGY Aerobic Pathways take place in the presence of oxygen

    Anaerobic Pathways take place in the absence of oxygen

  • Both pathways: 1) Begin with Glycolysis 2) Produce a Pyruvic Acid Intermediate 3) Differ in ATP production and final productTWO PATHWAYS EXIST FOR ACCESSING STORED ENERGY Aerobic Pathways take place in the presence of oxygen

    Anaerobic Pathways take place in the absence of oxygen

  • STEPS OF CELLULAR RESPIRATION

  • STEP 1: GLYCOLYSIS6-carbon glucose molecule is broken down into two 3-carbon pyruvic acid molecules.

  • STEP 1: GLYCOLYSIS6-carbon glucose molecule is broken down into two 3-carbon pyruvic acid molecules.Location: cytoplasmReactant: glucoseProducts: pyruvic acid and 2 ATPsAnaerobic: does not require oxygen

  • If oxygen is present then Aerobic respiration occurs

    If oxygen is not available then cells continue to perform glycolysis to make 2 ATPs

  • MITOCHONDRIA PARTSMatrix: Fluid Inner membrane: folded membrane inside mitochondriaCristae: inner folds of innermembraneIntermembrane space: space between outer and innermembrane

  • Krebs Cycle: Series of reactions that occur in mitochondrial matrix

    STEP 2: KREBS CYCLE

  • Krebs Cycle: Series of reactions that occur in mitochondrial matrix

    Reactants: Pyruvic acid (from glycolysis)

    STEP 2: KREBS CYCLE

  • Krebs Cycle: Series of reactions that occur in mitochondrial matrix

    Reactants: Pyruvic acid (from glycolysis)

    Products: 2 CO2 2 ATPNADH (e- carrier)STEP 2: KREBS CYCLE

  • The big ATP payoff Location: cristae (inner membrane) of mitochondriaReactants: NADH, O2Products: NAD+, H2O, 34 ATP

    STEP 3: ELECTRON TRANSPORT CHAIN AND CHEMIOSMOSIS

  • NADH transfers e- to the Electron transport chain (e- move down a series of proteins)Figure 4.22

  • NADH transfers e- to the Electron transport chain (e- move down a series of proteins)At the end of the chain, the electrons combine with oxygen & H+ to produce H2O.Figure 4.22

  • STEP 3: ELECTRON TRANSPORT CHAIN AND CHEMIOSMOSISEnergy from the e- pulls H+ into the intermembrane space.Figure 4.22

  • STEP 3: ELECTRON TRANSPORT CHAIN AND CHEMIOSMOSISH+ move from HIGH conc. to LOW conc.

  • STEP 3: ELECTRON TRANSPORT CHAIN AND CHEMIOSMOSISH+ move from HIGH conc. to LOW conc. They diffuse through ATP synthase, generating 34 ATPs (chemiosmosis)

  • 2 ATP from glycolysis2 ATP from Krebs Cycle

  • 2 ATP from glycolysis2 ATP from Krebs Cycle34 ATP from ETC (chemiosmosis)

  • 2 ATP from glycolysis2 ATP from Krebs Cycle34 ATP from ETC (chemiosmosis) 38 ATP Made In Total

  • 2 ATP from glycolysis2 ATP from Krebs Cycle34 ATP from ETC (chemiosmosis) 38 ATP Made In Total- 2 ATP for transporting pyruvic acid into the Mitochondria from Glycolysis

  • 2 ATP from glycolysis2 ATP from Krebs Cycle34 ATP from ETC (chemiosmosis) 38 ATP Made In Total- 2 ATP for transporting pyruvic acid into the Mitochondria from Glycolysis 36 Net ATP MadeAerobic Respiration is 20 times more efficient than Glycolysis alone.

  • ANAEROBIC VS. AEROBIC Anaerobic pathway (fermentation): Glycolysis 2 ATP

  • ANAEROBIC VS. AEROBIC Anaerobic pathway (fermentation): Glycolysis 2 ATP

    Aerobic Pathway:Glycolysis + Krebs Cycle + ETC 36 ATP

  • MAKE AND FILL IN THIS CHART

    ProcessLocationReactantsProducts# of ATP MadeGlycolysisKrebs CycleElectron Transport Chain

  • MOVIES: 342101, 342201 & 342301

  • Fact: Our bodies uses ATP at the rate of about 1 million molecules per cell per second.

    There are more than 100 trillion cells in the human body. Thats about 100,000,000,000,000,000,000 ATP molecules used in your body each second!

  • What is the relationship between autotrophs and heterotrophs?

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