Amino Acid Breakdown and Urea Cycle Process
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Questions and Answers

Which enzyme catalyzes the condensation of NH4 ions with CO2 to form Carbomyl phosphate?

  • Carbamyl phosphate synthase I (correct)
  • Arginosuccinate synthetase
  • Carbamyl phosphate synthase II
  • Ornithine transcarbamylase
  • What is the rate-limiting step in the formation of Carbomyl phosphate?

  • Formation of Carbomyl phosphate (correct)
  • Formation of Citrulline
  • Formation of Arginosuccinate
  • Formation of Ornithine
  • Which enzyme is involved in pyrimidine synthesis and accepts amino group from glutamine?

  • Carbamyl phosphate synthase I
  • Ornithine transcarbamylase
  • Carbamyl phosphate synthase II (correct)
  • Arginosuccinate synthetase
  • What molecule is synthesized from Carbomyl phosphate and ornithine by ornithine transcarbamylase?

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

    Which amino acid is neither present in tissue proteins nor in blood, but is found in milk?

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

    What enzyme condenses citrulline with aspartate to form arginosuccinate?

    <p>Arginosuccinate synthetase</p> Signup and view all the answers

    Which enzyme incorporates the second amino group of urea?

    <p>Arginosuccinate synthetase</p> Signup and view all the answers

    What is immediately broken down to inorganic phosphate during the formation of arginosuccinate?

    <p>AMP and Ppi 2 High energy bonds</p> Signup and view all the answers

    Where is carbamoyl phosphate synthetase II located?

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

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