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Krebs Cycle exam Flashcards

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Krebs Cycle exam
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  • Krebs Cycle


    The third stage of aerobic cellular respiration, also known as the citric acid cycle or tricarboxylic acid (TCA) cycle.

  • What is the first phase of the Krebs Cycle?


    Acetyl CoA Entry

  • Acetyl CoA


    A molecule that enters the Krebs Cycle and reacts with oxaloacetate to form citrate.

  • What are the key outputs of the Krebs Cycle per glucose molecule?


    2 ATP, 6 NADH, 2 FADH2, and 4 CO2

  • Citrate


    The first molecule produced in the Krebs Cycle when Acetyl CoA reacts with oxaloacetate.

  • What happens during citrate oxidation?


    Citrate is rearranged and oxidized, producing 1 ATP, 2 NADH, and 2 CO2.

  • Oxaloacetate


    A molecule that reacts with Acetyl CoA to form citrate and is regenerated at the end of the Krebs Cycle.

  • What is the purpose of oxaloacetate regeneration?


    To regenerate oxaloacetate, allowing the Krebs Cycle to continue.

  • NADH


    An electron carrier molecule produced during the Krebs Cycle.

  • What is the total output of ATP from the Krebs Cycle per glucose molecule?


    2 ATP

  • FADH2


    An electron carrier molecule produced during the Krebs Cycle.

  • What mnemonic can help remember the products of the Krebs Cycle?


    Krebs Fan Company (FANCO): FADH2, ATP, NADH, CO2

  • CO2


    A waste product of the Krebs Cycle that is exhaled.

  • What is the significance of the number 2264 in the Krebs Cycle?


    It represents the total output: 2 FADH2, 2 ATP, 6 NADH, and 4 CO2.

  • Substrate-level phosphorylation in Kreb's cycle


    Succinyl-CoA is converted to succinate, generating 1 ATP

  • What happens to the CoA portion of Acetyl CoA in the Krebs Cycle?


    It does not enter the Krebs Cycle and is recycled.

  • Electron Transport Chain (ETC)


    The final stage of aerobic cellular respiration where NADH and FADH2 are used to produce ATP.

  • How many revolutions of the Krebs Cycle occur per glucose molecule?


    Two revolutions

  • Pyruvate oxidation


    The process that converts pyruvate into Acetyl CoA before entering the Krebs Cycle.

  • What is produced during oxaloacetate regeneration?


    1 NADH and 1 FADH2

  • Aerobic cellular respiration


    A process that includes glycolysis, pyruvate oxidation, the Krebs Cycle, and the electron transport chain.

  • What is the main purpose of the Krebs Cycle?


    To produce electron carriers (NADH and FADH2) for the electron transport chain.

  • Citric acid cycle


    Another name for the Krebs Cycle, named after the first molecule produced, citrate.

  • What is the significance of citrate in the Krebs Cycle?


    It is the first molecule produced when Acetyl CoA reacts with oxaloacetate.

  • TCA cycle


    Another name for the Krebs Cycle, standing for tricarboxylic acid cycle.

  • What is the output of NADH from one revolution of the Krebs Cycle?


    3 NADH

  • Phase b of the Krebs Cycle


    Citrate oxidation