Glucose-Alanine Cycle Quiz
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Questions and Answers

Which of the following is the primary function of the glucose-alanine cycle?

  • To convert urea into amino nitrogen in the liver.
  • To replenish the energy supply of the liver.
  • To allow non-hepatic tissues to deliver the amino portion of catabolized amino acids to the liver for excretion as urea. (correct)
  • To generate pyruvate in muscle and other peripheral tissues.
  • Which molecule is transaminated to alanine in the glucose-alanine cycle?

  • Glucose
  • Amino nitrogen
  • Urea
  • Pyruvate (correct)
  • What is the donor of the amino group in the transamination reaction in the glucose-alanine cycle?

  • An α-amino acid (correct)
  • Urea
  • Pyruvate
  • Glucose
  • What is the indirect mechanism for muscle to eliminate nitrogen in the glucose-alanine cycle?

    <p>Transamination of pyruvate to alanine which is returned to the liver for gluconeogenesis.</p> Signup and view all the answers

    What is the fate of the amino nitrogen in the glucose-alanine cycle?

    <p>It is converted to urea in the urea cycle.</p> Signup and view all the answers

    What is the α-keto acid generated in the transamination reaction in the glucose-alanine cycle?

    <p>Depends on the α-amino acid used as the donor of the amino group.</p> Signup and view all the answers

    What is the significance of the glucose-alanine cycle in energy metabolism?

    <p>It replenishes the energy supply of muscle and other peripheral tissues.</p> Signup and view all the answers

    Which amino acid is used as a donor of the amino group in the transamination reaction that generates alanine?

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

    What is the major function of the glucose-alanine cycle?

    <p>To deliver the amino portion of catabolized amino acids to the liver</p> Signup and view all the answers

    What is the name of the cycle that describes the conversion of pyruvate to alanine and back to pyruvate in the liver?

    <p>Glucose-alanine cycle</p> Signup and view all the answers

    What is the fate of the amino nitrogen in the urea cycle?

    <p>It is excreted as urea</p> Signup and view all the answers

    What is the role of the transamination reaction in the glucose-alanine cycle?

    <p>To allow muscle cells to eliminate nitrogen while replenishing their energy supply</p> Signup and view all the answers

    Which tissues are involved in the glucose-alanine cycle?

    <p>Both hepatic and non-hepatic tissues</p> Signup and view all the answers

    What is the end product of the glucose-alanine cycle?

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

    Study Notes

    Glucose-Alanine Cycle

    • The primary function of the glucose-alanine cycle is to eliminate excess nitrogen in the form of alanine from muscles and convert it back to pyruvate in the liver.
    • In the glucose-alanine cycle, pyruvate is transaminated to alanine.
    • The donor of the amino group in the transamination reaction is glutamate.
    • The indirect mechanism for muscle to eliminate nitrogen in the glucose-alanine cycle is by releasing alanine into the bloodstream, which is then transported to the liver.
    • The fate of the amino nitrogen in the glucose-alanine cycle is that it is converted back to pyruvate in the liver and eventually used for gluconeogenesis.
    • The α-keto acid generated in the transamination reaction is pyruvate.
    • The significance of the glucose-alanine cycle in energy metabolism is that it allows muscles to conserve energy by eliminating excess nitrogen and converting it back to a usable energy source.
    • Glutamate is the amino acid used as a donor of the amino group in the transamination reaction that generates alanine.
    • The major function of the glucose-alanine cycle is to eliminate excess nitrogen from muscles and convert it back to a usable energy source in the liver.
    • The process that describes the conversion of pyruvate to alanine and back to pyruvate in the liver is also known as the glucose-alanine cycle.
    • The fate of the amino nitrogen in the urea cycle is that it is excreted in the form of urea.
    • The role of the transamination reaction in the glucose-alanine cycle is to convert pyruvate to alanine and back to pyruvate.
    • The tissues involved in the glucose-alanine cycle are muscles and liver.
    • The end product of the glucose-alanine cycle is pyruvate, which can be used for gluconeogenesis.

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    Description

    Test your knowledge on the glucose-alanine cycle with this quiz! Learn about the process of transaminating pyruvate to alanine in muscles and its role in gluconeogenesis. Dive into the details of the α-amino acid donor and α-keto acid generation. Challenge yourself with questions that cover the indirect mechanism for muscle to eliminate excess nitrogen and maintain glucose levels.

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