Cellular Respiration Processes Quiz
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Questions and Answers

What is the main purpose of fermentation in cellular respiration?

  • To split triglycerides into glycogen and fatty acids
  • To recycle NADH back to NAD+ for glycolysis to continue (correct)
  • To generate NADH and FADH2 for the electron transport chain
  • To convert amino acids into glucose
  • Which of the following molecules can be used as an alternate substrate for cellular respiration when glucose is not available?

  • Triglycerides
  • Amino acids
  • Both amino acids and triglycerides (correct)
  • Neither amino acids nor triglycerides
  • What is the purpose of the deamination process when using amino acids as an alternate substrate for cellular respiration?

  • To convert the amino acids into glucose
  • To remove the nitrogen from the amino acids (correct)
  • To generate NADH and FADH2 for the electron transport chain
  • To split the amino acids into glycogen and fatty acids
  • When triglycerides are used as an alternate substrate for cellular respiration, what are the two main products that can be used for energy production?

    <p>Glycogen and acetyl-CoA</p> Signup and view all the answers

    Which of the following is NOT a step in the process of using amino acids or triglycerides as alternate substrates for cellular respiration?

    <p>Conversion of acetyl-CoA into glucose through gluconeogenesis</p> Signup and view all the answers

    What is the main role of the electron transport chain (ETC) in the process of oxidative phosphorylation?

    <p>All of the above</p> Signup and view all the answers

    If the electron transport chain is blocked at complex III, what would be the expected effect on ATP production?

    <p>ATP production would decrease due to a lack of proton gradient formation</p> Signup and view all the answers

    What is the purpose of the investment phase of glycolysis?

    <p>To invest energy in the form of ATP to prepare the glucose molecule for later energy extraction</p> Signup and view all the answers

    Which of the following components is NOT required for the process of oxidative phosphorylation in the mitochondria?

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

    What is the primary role of the electron transport chain (ETC) in cellular respiration?

    <p>To pump hydrogen ions (H+) across the inner mitochondrial membrane, creating a proton motive force</p> Signup and view all the answers

    Which of the following accurately describes the role of oxygen in cellular respiration?

    <p>Oxygen is the final electron acceptor in the electron transport chain</p> Signup and view all the answers

    If the electron transport chain is inhibited, which process(es) can still occur to produce ATP?

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

    In which process does substrate-level phosphorylation occur during cellular respiration?

    <p>Glycolysis and the citric acid cycle</p> Signup and view all the answers

    What is the primary function of the citric acid cycle in cellular respiration?

    <p>To oxidize acetyl-CoA and produce electron carriers (NADH and FADH2)</p> Signup and view all the answers

    Which of the following is the correct sequence of events in cellular respiration?

    <p>Glycolysis → Pyruvate oxidation → Citric acid cycle → Electron transport chain</p> Signup and view all the answers

    What is the primary role of NADH and FADH2 in cellular respiration?

    <p>To transfer high-energy electrons to the electron transport chain for ATP synthesis</p> Signup and view all the answers

    What is the term used to describe the process of ATP synthesis driven by the proton motive force across the inner mitochondrial membrane?

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

    Study Notes

    Fermentation and Cellular Respiration

    • Fermentation recycles NADH back to NAD+ to maintain glycolysis.
    • Fermentation is involved in the catabolism of glucose to produce ATP.

    Alternate Substrates for Cellular Respiration

    • Amino acids can be converted into glucose, acetyl-CoA, or citric acid cycle intermediates after deamination.
    • Triglycerides can be split into glycogen and fatty acids, which can be converted into acetyl-CoA, NADH, and FADH2 through beta-oxidation.

    Cellular Respiration Overview

    • Cellular respiration is the process of breaking down glucose to produce ATP using substrate-level and oxidative phosphorylation.
    • The three stages of cellular respiration are glycolysis, pyruvate oxidation, and the citric acid cycle, followed by oxidative phosphorylation.

    Glycolysis

    • Glycolysis is the first stage of cellular respiration, using glucose as its preferred substrate.
    • Glycolysis produces 2 ATP (net, via substrate-level phosphorylation), 2 NADH, and 2 pyruvate.
    • Contrast the investment and payoff phases in glycolysis.

    Pyruvate Oxidation and Citric Acid Cycle

    • The two pyruvates from glycolysis are imported into the mitochondria via pyruvate oxidation, producing 2 acetyl-CoA, 2 NADH, and 2 CO2.
    • The 2 acetyl-CoA enter the citric acid cycle, producing 2 ATP (via substrate-level phosphorylation), 6 NADH, and 2 FADH2.

    Oxidative Phosphorylation

    • In the mitochondrial matrix, NADH and FADH2 from glycolysis, pyruvate oxidation, and the citric acid cycle donate high-energy electrons to the mitochondrial electron transport chain (ETC).
    • The ETC uses the energy to pump H+ into the intermembrane space, generating proton motive force (PMF) across the inner membrane.
    • The flow of hydrogen ions back across the inner membrane powers the production of ATP by the enzyme complex ATP synthase through chemiosmosis.
    • Oxidative phosphorylation is the process of generating ATP through the ETC coupled to chemiosmosis in the mitochondria.

    Electron Transport Chain and ATP Synthesis

    • The electron transport chain is the process of transferring electrons from high-energy donors to oxygen, generating PMF.
    • The components required for oxidative phosphorylation in the three compartments around the mitochondrial inner membrane are:
      • Inner membrane: electron transport chain and ATP synthase
      • Intermembrane space: hydrogen ions
      • Mitochondrial matrix: NADH, FADH2, and ATP synthase
    • The role of each component in the process is:
      • Electron transport chain: generates PMF
      • ATP synthase: produces ATP through chemiosmosis
      • Hydrogen ions: drive ATP synthesis through chemiosmosis

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    Description

    Test your knowledge on the process of cellular respiration, including glycolysis, pyruvate oxidation, and ATP production through substrate level and oxidative phosphorylation.

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