Transaminases: Enzymes and Features
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Questions and Answers

Which enzyme is responsible for cleaving one amino acid at a time from amino terminals of peptides?

  • Dipeptidase
  • Pepsin
  • Aminopeptidase (correct)
  • Tripeptidase
  • Where does the absorption of amino acids primarily occur?

  • Stomach
  • Pancreas
  • Upper small intestine (correct)
  • Large intestine
  • Which enzyme catalyzes the reversible transfer of an amino group between an 'α' amino acid and an 'α' keto acid?

  • Phosphatase
  • Kinase
  • Transaminase (correct)
  • Dehydrogenase
  • Which phase of protein digestion involves the conversion of casein into calcium paracaseinate?

    <p>Gastric phase</p> Signup and view all the answers

    Except for lysine, threonine, proline, and hydroxyproline, which amino acids undergo transamination reactions?

    <p>Alanine, leucine, isoleucine, valine</p> Signup and view all the answers

    What is the energy-dependent process by which amino acids are absorbed along with sodium?

    <p>Active transport</p> Signup and view all the answers

    What is the main function of transamination reactions in the body?

    <p>Synthesis of essential amino acids</p> Signup and view all the answers

    What is the total pool of amino acids available in the blood at any given time called?

    <p>Amino acid pool</p> Signup and view all the answers

    In which conditions are transaminase levels typically increased, making them useful in diagnosis?

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

    Which enzyme converts dipeptides to amino acids?

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

    What is the fate of ammonia generated from deamination reactions in the body?

    <p>Converted to urea for excretion</p> Signup and view all the answers

    How is the toxic ammonia transported in the body to prevent its harmful effects?

    <p>As glutamine from muscle to liver</p> Signup and view all the answers

    Which of the following amino acids can be used to synthesize glycine?

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

    What are the substrates for Glycine synthase in the biosynthesis of glycine?

    <p>CO2 and NH3</p> Signup and view all the answers

    In the degradation of glycine, which molecule is not involved as a precursor for glycine synthesis?

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

    Which amino acid is a nitrogen atom donor in the urea cycle?

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

    Which molecule is a positive allosteric effector of carbamoyl phosphate synthetase1 (CPS-1)?

    <p>N-acetyl glutamate</p> Signup and view all the answers

    Which treatment option is used to remove ammonia from blood in urea cycle defects?

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

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