Cellular Energetics and Biochemical Pathways Quiz
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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

38

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 ______

<p>O2</p> Signup and view all the answers

Alcohol fermentation (anaerobic) Yield ethanol and CO2 Alcohol and bread production by ______

<p>yeast</p> Signup and view all the answers

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