Nitrogen Metabolism MCQs : This section focuses on the "Nitrogen Metabolism". These Multiple Choice Questions (MCQs) should be practiced to improve the Nitrogen Metabolism skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Which of the following is used as carbon atom source while producing urea in the urea cycle?
A. Arginine
B. Aspartic acid
C. Carbon dioxide
D. Glucose
Question 2
Dinitrogenase reductase is a ____________
A. Monomer
B. Dimer
C. Trimer
D. Tetramer
Question 3
How many molecules of ATP are hydrolysed to form two molecule of ammonia?
A. 10
B. 5
C. 16
D. 15
Question 4
Nitrate is reduced and ultimately produces N2 through a series of intermediate gaseous nitrogen oxide products is called ____________
A. Nitrogen fixation
B. Nitrification
C. Denitrification
D. Nitrogen assimilation
Question 5
Ammonia or ammonium is oxidized to nitrite followed by the oxidation of nitrite to nitrate is called ____________
A. Nitrogen fixation
B. Nitrification
C. Denitrification
D. Nitrogen assimilation
Question 6
An intermediate of the citric acid cycle that undergoes reductive amination with glutamine as nitrogen donor is ____________
A. α-ketoglutarate
B. Glutamine
C. NADPH
D. H+
Question 7
Urea cycle converts
A. ammonia into a less toxic form
B. ketoacids into amino acids
C. amino acids into ketoacids
D. none of these
Question 8
Uridylylation and deuridylylation of PII are brought about by a single enzyme ______________
A. Uridylyltransferase
B. Adenylyltransferase
C. Glutamate synthase
D. Dinitrogenase
Question 9
Dinitrogenase is a ____________
A. Monomer
B. Dimer
C. Trimer
D. Tetramer
Question 10
Nitrogen metabolism is not only one of the basic processes of plant physiology, but also one of the important parts of global chemical cycle.
A. TRUE
B. FALSE
Question 11
Formation of organic nitrogen compounds like amino acids from inorganic nitrogen compounds is called as ____________
A. Nitrogen fixation
B. Nitrification
C. Denitrification
D. Nitrogen assimilation
Question 12
Which of the following catalyzes reactions that incorporate nitrogen derived from glutamine?
A. Glutamine amidotransferase
B. Adenylyltransferase
C. Glutamate synthase
D. Glutamine synthase
Question 13
Which of the following amino acid do not fall under the category of essential amino acid?
A. Histidine
B. Leucine
C. Glycine
D. Methionine
Question 14
Conversion of nitrogen to ammonia or nitrogenous compounds is termed as ____________
A. Nitrogen fixation
B. Nitrification
C. Denitrification
D. Nitrogen assimilation
Question 15
The products of 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
Question 16
The nitrogen atoms of urea produced in the urea cycle are derived from
A. nitrate
B. ammonia and aspartic acid
C. nitrite
D. ammonia
Question 17
The nitrogen metabolism is associated with carbonic metabolism through key enzyme regulations and the conversion of products, which consists of basic life process.
A. Yes
B. No
Question 18
The inputs to one cycle of the urea cycle are
A. 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of carbon dioxide, 3 molecules of ATP
B. 1 molecule of urea, 1 molecule of ammonia, 3 molecules of ATP and 1 molecule of fumaric acid
C. 1 molecule of fumaric acid, 1 molecule of urea, 3 molecules of AMP
D. None of the above
Question 19
Nitrate reduction can be carried out by
A. only microorganism
B. plant and microorganism
C. only plants
D. none of these