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

Correct Answer: C. 16

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

Correct Answer: B. ammonia and aspartic acid

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

Correct Answer: B. 1 molecule of fumaric acid, 1 molecule of urea, 1 molecule of AMP, 2 molecules of ADP

4. Nitrate reduction can be carried out by

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

Correct Answer: B. plant and microorganism

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

Correct Answer: C. Carbon dioxide

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