Cellular Respiration Overview: ATP Production and Electron Transport Chain
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Questions and Answers

In which step of cellular respiration does the formation of FADH2 occur?

  • Electron Transport Chain
  • Glycolysis
  • Krebs Cycle (correct)
  • Pryuvate Oxidation

    • How many molecules of ATP are generated from glycolysis?

  • 2 ATP (correct)
  • 0 ATP
  • 1 ATP
  • 3 ATP

    • Which process releases CO2 as a byproduct?

  • Electron Transport Chain
  • Lactic Acid Fermentation
  • Pryuvate Oxidation (correct)
  • Alcohol Fermentation

    • What compound is formed when pyruvate is converted to ethanol during alcohol fermentation?

    <p>CO2</p> Signup and view all the answers

    Which molecule combines with acetyl-CoA to form citrate in the Krebs Cycle?

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

    Where do electron carriers drop off electrons to generate ATP in cellular respiration?

    <p>Intermembrane Space</p> Signup and view all the answers

    Which molecule in the TCA Cycle contributes directly to the formation of ATP?

    <p>FADH2</p> Signup and view all the answers

    In cellular respiration, what is the primary role of CO2 release?

    <p>To remove waste</p> Signup and view all the answers

    Which stage of cellular respiration directly involves the production of 2 ATP?

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

    What compound is formed by the combination of oxaloacetate and acetyl-CoA at the beginning of the TCA Cycle?

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

    Which molecule directly interacts with cytochrome oxidase in the Electron Transport Chain to produce water?

    <p>FADH2</p> Signup and view all the answers

    During chemiosmosis, the energy released as electrons move through the E.T.C. is primarily used for what purpose?

    <p>To pump protons (H+) to the intermembrane space</p> Signup and view all the answers

    What is the key role of FADH2 in the process of ATP formation through oxidative phosphorylation?

    <p>Generates a greater amount of ATP compared to NADH</p> Signup and view all the answers

    What is the total ATP yield per glucose molecule produced during oxidative phosphorylation?

    <p>36 ATP</p> Signup and view all the answers

    What is the fate of the electrons when there is no oxygen available as the final electron acceptor in the Electron Transport Chain?

    <p>They back up the Electron Transport Chain</p> Signup and view all the answers

    Which molecule serves as a precursor for the generation of oxaloacetate in cellular respiration?

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

    What happens if cyanide inhibits the enzyme cytochrome oxidase during cellular respiration?

    <p>Electrons stop flowing through the ETC</p> Signup and view all the answers

    How does ATP production occur in chemiosmosis during oxidative phosphorylation?

    <p>Movement of protons through ATP synthase generates ATP</p> Signup and view all the answers

    Study Notes

    Cellular Respiration

    • FADH2 Formation: FADH2 is formed during the Krebs Cycle, specifically in the step catalyzed by the enzyme succinate dehydrogenase.

    • ATP from Glycolysis: Glycolysis generates a net total of 2 ATP molecules per glucose molecule.

    • CO2 Release: The Krebs Cycle releases carbon dioxide (CO2) as a byproduct.

    • Ethanol Formation: Acetaldehyde is formed when pyruvate is converted to ethanol during alcohol fermentation.

    • Citrate Formation: Oxaloacetate combines with acetyl-CoA to form citrate in the Krebs Cycle.

    • Electron Carrier Interaction: Electron carriers drop off electrons to the electron transport chain, specifically at complex I and complex II.

    • ATP Production in TCA Cycle: GTP is a direct contributor to ATP formation in the TCA cycle.

    • CO2 Release Role: CO2 release is crucial for maintaining cellular pH and regulating metabolic processes.

    • Direct ATP Production: The substrate-level phosphorylation step in glycolysis directly involves the production of 2 ATP molecules.

    • Citrate Formation in TCA Cycle: The combination of oxaloacetate and acetyl-CoA at the beginning of the TCA cycle yields citrate.

    • Cytochrome Oxidase Interaction: Reduced cytochrome c directly interacts with cytochrome oxidase in the Electron Transport Chain to produce water.

    • Energy Use in Chemiosmosis: During chemiosmosis, the energy released as electrons move through the ETC is mainly used to pump protons across the mitochondrial membrane, creating a concentration gradient.

    • FADH2 Role: FADH2 plays a role in ATP formation through oxidative phosphorylation by donating electrons to the electron transport chain at Complex II.

    • ATP Yield from Oxidative Phosphorylation: The total ATP yield per glucose molecule during oxidative phosphorylation is around 32-34 ATP molecules.

    • Electron Fate Without Oxygen: In the absence of oxygen, electrons are accepted by organic molecules, leading to fermentation.

    • Oxaloacetate Precursor: Malate serves as a precursor for the generation of oxaloacetate in cellular respiration.

    • Cyanide Inhibition: Cyanide inhibits cytochrome oxidase, preventing the electron transport chain from functioning and leading to ATP depletion.

    • Chemiosmosis ATP Production: The concentration gradient of protons generated in the intermembrane space is the driving force behind ATP synthase, which uses the energy to synthesize ATP through chemiosmosis.

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    Description

    Test your knowledge on cellular respiration processes such as Glycolysis, Pyruvate Oxidation, TCA Cycle, Electron Transport Chain, and Chemiosmosis. Learn about the ATP and NADH produced at each stage and the structure of the Electron Transport Chain.

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