Nitrogen Metabolism – Section 1

1. How many molecules of ATP are hydrolyzed to form two molecules of ammonia?

A. 10
B. 5
C. 16
D. 15

Show Answer

2. The nitrogen atoms of urea produced in the urea cycle are derived from

A. nitrate
B. ammonia and aspartic acid
C. nitrite
D. ammonia

Show Answer

3. The products of the urea cycle are

A. 1 molecule of urea, 1 molecule of ammonia, 1 molecule of ATP and 1 molecule of fumaric acid
B. 1 molecule of fumaric acid, 1 molecule of urea, 1 molecule of AMP, 2 molecules of ADP
C. 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of fumaric acid, 1 molecule of ATP
D. None of the above

Show Answer

4. Nitrate reduction can be carried out by

A. only microorganism
B. plant and microorganism
C. only plants
D. none of these

Show Answer

5. Which of the following is used as a carbon atom source while producing urea in the urea cycle?

A. Arginine
B. Aspartic acid
C. Carbon dioxide
D. Glucose

Show Answer