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Krebs Cycle quiz

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  • What are two other names for the Krebs Cycle?
    The Krebs Cycle is also known as the citric acid cycle and the TCA cycle.
  • What molecule enters the Krebs Cycle after pyruvate oxidation?
    Acetyl CoA enters the Krebs Cycle after pyruvate oxidation.
  • What does Acetyl CoA react with to form citrate in the first phase of the Krebs Cycle?
    Acetyl CoA reacts with oxaloacetate to form citrate.
  • Which part of Acetyl CoA actually enters the Krebs Cycle?
    Only the two carbon atoms of Acetyl CoA enter the Krebs Cycle; the CoA portion does not.
  • What is produced during the citrate oxidation phase of the Krebs Cycle?
    Citrate oxidation produces 1 ATP, 2 NADH, and 2 CO2 per Acetyl CoA.
  • What is the purpose of the oxaloacetate regeneration phase in the Krebs Cycle?
    The oxaloacetate regeneration phase regenerates oxaloacetate and produces 1 NADH and 1 FADH2.
  • How many rounds of the Krebs Cycle occur per glucose molecule?
    Two rounds of the Krebs Cycle occur per glucose molecule because each glucose produces two Acetyl CoA.
  • What is the total output of ATP, NADH, FADH2, and CO2 from the Krebs Cycle per glucose molecule?
    The total output is 2 ATP, 6 NADH, 2 FADH2, and 4 CO2 per glucose molecule.
  • What mnemonic can help you remember the outputs of the Krebs Cycle?
    The mnemonic 'Krebs Fan Company' helps remember the outputs: FADH2, ATP, NADH, and CO2.
  • Where do NADH and FADH2 produced in the Krebs Cycle go next?
    NADH and FADH2 go to the electron transport chain, the next stage of aerobic respiration.
  • What happens to the CO2 produced in the Krebs Cycle?
    The CO2 produced in the Krebs Cycle is exhaled from the body.
  • How many NADH molecules are produced per round of the Krebs Cycle?
    Three NADH molecules are produced per round of the Krebs Cycle.
  • How many ATP molecules are produced per round of the Krebs Cycle?
    One ATP molecule is produced per round of the Krebs Cycle.
  • Why is the Krebs Cycle considered a cycle?
    It is considered a cycle because it regenerates oxaloacetate, allowing the process to repeat.
  • What is the significance of citrate in the Krebs Cycle?
    Citrate is the first molecule produced in the cycle, giving the cycle its alternative name, the citric acid cycle.