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?
- Histidine
- Leucine
- Glycine
- Methionine
Answer : 3
Question 2 : Urea cycle converts
- ammonia into a less toxic form
- ketoacids into amino acids
- amino acids into ketoacids
- none of these
Answer : 1
Question 3 : The inputs to one cycle of the urea cycle are
- 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of carbon dioxide, 3 molecules of ATP
- 1 molecule of urea, 1 molecule of ammonia, 3 molecules of ATP and 1 molecule of fumaric acid
- 1 molecule of fumaric acid, 1 molecule of urea, 3 molecules of AMP
- None of the above
Answer : 1
Question 4 : How many molecules of ATP are hydrolysed to form two molecule of ammonia?
- 10
- 5
- 16
- 15
Answer : 3
Question 5 : The nitrogen atoms of urea produced in the urea cycle are derived from
- nitrate
- ammonia and aspartic acid
- nitrite
- ammonia
Answer : 2
Question 6 : The products of urea cycle are
- 1 molecule of urea, 1 molecule of ammonia, 1 molecule of ATP and 1 molecule of fumaric acid
- 1 molecule of fumaric acid, 1 molecule of urea, 1 molecule of AMP, 2 molecules of ADP
- 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of fumaric acid, 1 molecule of ATP
- None of the above
Answer : 2
Question 7 : Nitrate reduction can be carried out by
- only microorganism
- plant and microorganism
- only plants
- none of these
Answer : 2
Question 8 : Which of the following is used as carbon atom source while producing urea in the urea cycle?
- Arginine
- Aspartic acid
- Carbon dioxide
- Glucose
Answer : 3