Nitrogen Metabolism(Biochemistry ) Questions and Answers

Question 1. How many molecules of ATP are hydrolysed to form two molecule of ammonia?
  1.    5
  2.    10
  3.    15
  4.    16
Explanation:-
Answer: Option D. -> 16
Question 2. Which of the following is used as carbon atom source while producing urea in the urea cycle?
  1.    Arginine
  2.    Aspartic acid
  3.    Glucose
  4.    Carbon dioxide
Explanation:-
Answer: Option D. -> Carbon dioxide
Question 3. The products of urea cycle are
  1.    None of these
  2.    1 molecule of urea, 1 molecule of ammonia, 1 molecule of ATP and 1 molecule of fumaric acid
  3.    1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of fumaric acid, 1 molecule of ATP
  4.    1 molecule of fumaric acid, 1 molecule of urea, 1 molecule of AMP, 2 molecules of ADP
Explanation:-
Answer: Option D. -> 1 molecule of fumaric acid, 1 molecule of urea, 1 molecule of AMP, 2 molecules of ADP
Question 4. The nitrogen atoms of urea produced in the urea cycle are derived from
  1.    ammonia
  2.    ammonia and aspartic acid
  3.    nitrate
  4.    nitrite
Explanation:-
Answer: Option B. -> ammonia and aspartic acid
Question 5. Nitrate reduction can be carried out by
  1.    only microorganism
  2.    plant and microorganism
  3.    only plants
  4.    none of these
Explanation:-
Answer: Option B. -> plant and microorganism
Question 6. Which of the following amino acid do not fall under the category of essential amino acid?
  1.    Leucine
  2.    Methionine
  3.    Histidine
  4.    Glycine
Explanation:-
Answer: Option D. -> Glycine
Question 7. 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 fumaric acid, 1 molecule of urea, 3 molecules of AMP
  3.    None of these
  4.    1 molecule of urea, 1 molecule of ammonia, 3 molecules of ATP and 1 molecule of fumaric acid
Explanation:-
Answer: Option A. -> 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of carbon dioxide, 3 molecules of ATP
Question 8. Urea cycle converts
  1.    ketoacids into amino acids
  2.    amino acids into ketoacids
  3.    none of these
  4.    ammonia into a less toxic form
Explanation:-
Answer: Option D. -> ammonia into a less toxic form
Question 9.  How many molecules of ATP are hydrolysed to form two molecule of ammonia?
  1.    10
  2.    5
  3.    16
  4.    15
Explanation:-
Answer: Option C. -> 16
Question 10.  The nitrogen atoms of urea produced in the urea cycle are derived from
  1.    nitrate
  2.    ammonia and aspartic acid
  3.    nitrite
  4.    ammonia
Explanation:-
Answer: Option B. -> ammonia and aspartic acid
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