Nitrogen Metabolism Questions and Answers

Multiple Choice Questions and Answers on Nitrogen Metabolism

Question 1 : Which of the following amino acid do not fall under the category of essential amino acid?

  1. Histidine
  2. Leucine
  3. Glycine
  4. Methionine

Answer : 3

Question 2 : Urea cycle converts

  1. ammonia into a less toxic form
  2. ketoacids into amino acids
  3. amino acids into ketoacids
  4. none of these

Answer : 1

Question 3 : The inputs to one cycle of the urea cycle are

  1. 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of carbon dioxide, 3 molecules of ATP
  2. 1 molecule of urea, 1 molecule of ammonia, 3 molecules of ATP and 1 molecule of fumaric acid
  3. 1 molecule of fumaric acid, 1 molecule of urea, 3 molecules of AMP
  4. None of the above

Answer : 1

Question 4 : How many molecules of ATP are hydrolysed to form two molecule of ammonia?

  1. 10
  2. 5
  3. 16
  4. 15

Answer : 3

Question 5 : The nitrogen atoms of urea produced in the urea cycle are derived from

  1. nitrate
  2. ammonia and aspartic acid
  3. nitrite
  4. ammonia

Answer : 2

Question 6 : The products of urea cycle are

  1. 1 molecule of urea, 1 molecule of ammonia, 1 molecule of ATP and 1 molecule of fumaric acid
  2. 1 molecule of fumaric acid, 1 molecule of urea, 1 molecule of AMP, 2 molecules of ADP
  3. 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of fumaric acid, 1 molecule of ATP
  4. None of the above

Answer : 2

Question 7 : Nitrate reduction can be carried out by

  1. only microorganism
  2. plant and microorganism
  3. only plants
  4. none of these

Answer : 2

Question 8 : Which of the following is used as carbon atom source while producing urea in the urea cycle?

  1. Arginine
  2. Aspartic acid
  3. Carbon dioxide
  4. Glucose

Answer : 3