BIO 334 - Metabolic Biochemistry: Unit 4 - Pyruvate Dehydrogenase Complex and Citric Acid Cycle Quiz
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Questions and Answers

Where does the citric acid cycle occur in eukaryotes?

  • Inner mitochondrial membrane
  • Mitochondrial matrix (correct)
  • Cytosol
  • Cytoplasm
  • What is the primary purpose of the citric acid cycle?

  • To transport hydroxyl ions across the inner mitochondrial membrane
  • To form acetyl-CoA
  • To produce NADH and FADH2
  • To oxidize pyruvate to CO2 and generate ATP (correct)
  • What is the importance of the sulfhydryl group in coenzyme A?

  • It increases the stability of the coenzyme
  • It transports CO2 in metabolic pathways
  • It is responsible for capturing the acetyl group in a high-energy form (correct)
  • It acts as an electron carrier in oxidative phosphorylation
  • What maintains charge balance on either side of the inner mitochondrial membrane (IMM) during pyruvate transport?

    <p>Pyruvate carrier protein</p> Signup and view all the answers

    Which vitamin plays a crucial role in activating carriers like coenzyme A in metabolic pathways?

    <p>B-vitamins</p> Signup and view all the answers

    Where does pyruvate get completely oxidized to CO2 in the presence of oxygen?

    <p>Mitochondrial matrix</p> Signup and view all the answers

    Which organelle's inner membrane contains many transporters for moving citric acid cycle intermediates?

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

    What is the fate of pyruvate in the absence of oxygen?

    <p>Undergoes fermentation in the cytosol</p> Signup and view all the answers

    What feature of the outer mitochondrial membrane allows small molecules to pass through?

    <p>Porin protein complexes</p> Signup and view all the answers

    Which part of the mitochondrion is characterized by many infoldings into the matrix known as cristae?

    <p>Inner membrane</p> Signup and view all the answers

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