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Questions and Answers
Alcohol fermentation (anaerobic) Yield ethanol and CO2 Alcohol and bread production by yeast Kreb’s Cycle Central pathway in oxidation of fuels Eight enzyme-catalyzed reactions Product is starting material: ______ Each turn yields 2 CO2, 3 NADH, and 1 FADH2 (two turns per glucose) Occurs in mitochondria (Also called tricarboxylic acid cycle or Krebs cycle) Obtained ATP One glucose yields: 2 ATP in glycolysis 2 NADH in glycolysis 2 NADH as pyruvate enters citric acid cycle 2 ATP in citric acid cycle 6 NADH in citric acid cycle 2 FADH2 in citric acid cycle Each NADH can produce ~3 ATP and each FADH2 can produce ~2 ATP when O2 is present as final electron acceptor One glucose completely oxidized to CO2 yields up to ~38 ATP Electron transport Electrons from NADH and FADH2 are passed to O2 Regenerate NAD+ and FAD Form H2O Release energy Electron flow is coupled to pumping of protons (H+) across inner mitochondrial membrane (10 H+ per NADH) Creates proton gradient across membrane Oxidative Ph.
Alcohol fermentation (anaerobic) Yield ethanol and CO2 Alcohol and bread production by yeast Kreb’s Cycle Central pathway in oxidation of fuels Eight enzyme-catalyzed reactions Product is starting material: ______ Each turn yields 2 CO2, 3 NADH, and 1 FADH2 (two turns per glucose) Occurs in mitochondria (Also called tricarboxylic acid cycle or Krebs cycle) Obtained ATP One glucose yields: 2 ATP in glycolysis 2 NADH in glycolysis 2 NADH as pyruvate enters citric acid cycle 2 ATP in citric acid cycle 6 NADH in citric acid cycle 2 FADH2 in citric acid cycle Each NADH can produce ~3 ATP and each FADH2 can produce ~2 ATP when O2 is present as final electron acceptor One glucose completely oxidized to CO2 yields up to ~38 ATP Electron transport Electrons from NADH and FADH2 are passed to O2 Regenerate NAD+ and FAD Form H2O Release energy Electron flow is coupled to pumping of protons (H+) across inner mitochondrial membrane (10 H+ per NADH) Creates proton gradient across membrane Oxidative Ph.
Cycle
One glucose completely oxidized to CO2 yields up to ~______ ATP
One glucose completely oxidized to CO2 yields up to ~______ ATP
38
Electron flow is coupled to pumping of protons (H+) across inner mitochondrial membrane (10 H+ per NADH) Creates proton gradient across ______
Electron flow is coupled to pumping of protons (H+) across inner mitochondrial membrane (10 H+ per NADH) Creates proton gradient across ______
membrane
Electrons from NADH and FADH2 are passed to ______
Electrons from NADH and FADH2 are passed to ______
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Alcohol fermentation (anaerobic) Yield ethanol and CO2 Alcohol and bread production by ______
Alcohol fermentation (anaerobic) Yield ethanol and CO2 Alcohol and bread production by ______
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