Pyruvate Dehydrogenase Complex (PDH) Quiz
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Questions and Answers

Which enzyme in the Pyruvate Dehydrogenase Complex catalyzes the conversion of pyruvate to Acetyl CoA?

  • Pyruvate E2
  • Dihydrolipoyl Dehydrogenase
  • E1
  • Dihydrolipoyl Transacetylase (correct)
  • What is the advantage of having the Pyruvate Dehydrogenase Complex made up of multiple enzymes instead of just one?

  • Ability to catalyze multiple reactions concurrently (correct)
  • Increased specificity in substrate binding
  • Easier regulation of enzyme activity
  • Reduced need for cofactors
  • Which of the following is NOT a cofactor required by the Pyruvate Dehydrogenase Complex?

  • Lipoic Acid
  • Thiamine Pyrophosphate (TPP)
  • FAD (flavin adenine dinucleotide)
  • Ribonucleic Acid (RNA) (correct)
  • What type of reaction is catalyzed by the Pyruvate Dehydrogenase Complex?

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

    Which molecule is produced as a product of the Pyruvate Dehydrogenase Complex besides Acetyl CoA?

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

    What is the function of the Dihydrolipoyl Dehydrogenase enzyme in the Pyruvate Dehydrogenase Complex?

    <p>Regenerating enzyme activity in E1 after each cycle</p> Signup and view all the answers

    What is the function of Acetyl CoA in metabolism?

    <p>Energy production</p> Signup and view all the answers

    Which chapter in the course material covers the Pyruvate Dehydrogenase complex?

    <p>Chapter 18</p> Signup and view all the answers

    How many stages are involved in cellular respiration according to the text?

    <p>3</p> Signup and view all the answers

    Which component is described as the 'energy currency' in the text?

    <p>Adenosine Triphosphate (ATP)</p> Signup and view all the answers

    What does the Pyruvate Dehydrogenase complex (PDH) prepare for?

    <p>Citric Acid Cycle</p> Signup and view all the answers

    Which biomolecule is NOT mentioned as a component of ATP in the text?

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

    Which metabolic process involves oxidative phosphorylation?

    <p>Citric Acid Cycle</p> Signup and view all the answers

    What is Acetyl CoA's role in relation to biomolecules?

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

    Which molecule serves as a transient carbon carrier in the Pyruvate Dehydrogenase Complex?

    <p>Thiamine Pyrophosphate (TPP)</p> Signup and view all the answers

    What is the role of Lipoic Acid in the Pyruvate Dehydrogenase Complex?

    <p>Carries electrons and acyl groups</p> Signup and view all the answers

    Which vitamin is thiamine pyrophosphate (TPP) derived from?

    <p>Vitamin B1 (thiamine)</p> Signup and view all the answers

    What is the advantage of using a protein complex like the Pyruvate Dehydrogenase Complex?

    <p>Increases the rate of reaction due to high enzyme concentrations</p> Signup and view all the answers

    Which subunit of the Pyruvate Dehydrogenase Complex is associated with a lipoyl group?

    <p>E2</p> Signup and view all the answers

    What is the main function of Coenzyme A/Acetyl Coenzyme A in cellular respiration?

    <p>Carries electrons and acyl groups</p> Signup and view all the answers

    Why is substrate channeling advantageous in enzymatic reactions like those in the Pyruvate Dehydrogenase Complex?

    <p>Increases the local concentration of products</p> Signup and view all the answers

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