Nitrogen Excretion and the Urea Cycle MCQ

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• What are the inputs to one cycle of urea cycle?
  ক

  One molecule of CO2, one molecule of ammonia, three molecules of ATP and one molecule of aspartic acid

  খ

  One molecule of urea, one molecule of AMP, two molecules of ADP and one molecule of fumaric acid

  গ

  One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid

  ঘ

  Two molecules of urea, two molecules of ammonia, one molecule of ATP and one molecule of fumaric acid
• Urea cycle converts ___________
  ক

  Keto acids into amino acids

  খ

  Amino acids into keto acids

  গ

  Ammonia into a less toxic form

  ঘ

  Ammonia into a more toxic form
• Which of the following is not an essential amino acid?
  ক

  Glycine

  খ

  Leucine

  গ

  Methionine

  ঘ

  Histidine
• The carbon atom source while producing urea in the urea cycle is ___________
  ক

  CO2

  খ

  Glucose

  গ

  Aspartic acid

  ঘ

  Arginine
• What are the products of urea cycle?
  ক

  One molecule of urea, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid

  খ

  One molecule of urea, one molecule of AMP, two molecules of ADP and one molecule of fumaric acid

  গ

  One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid

  ঘ

  Two molecules of urea, two molecules of ammonia, one molecule of ATP and one molecule of fumaric acid
• Nitrogen atoms of urea produced in the urea cycle are derived from ___________
  ক

  Ammonia and aspartic acid

  খ

  Nitrate

  গ

  Nitrite

  ঘ

  Ammonia
• A second amino group is transferred to cituilline from ___________
  ক

  Aspartate

  খ

  Glutamate

  গ

  Alanine

  ঘ

  Guanine
• The first enzyme in the pathway carbamoyl phosphate synthase I, is allosterically activated by ___________
  ক

  N-acetylglutamate

  খ

  Acetyl coA

  গ

  Glutamate

  ঘ

  Carbamoyl phosphate
• Which is the first amino group entering into urea cycle?
  ক

  carbamoyl phosphate

  খ

  Ornithine

  গ

  Cituilline

  ঘ

  Argininosuccinate
• Urea production occurs almost exclusively in ___________
  ক

  Kidneys

  খ

  Liver

  গ

  Blood

  ঘ

  Urine