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Nitrogen Metabolism MCQ Questions & Answers

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

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Question 2

Dinitrogenase reductase is a ____________

A. Monomer
B. Dimer
C. Trimer
D. Tetramer

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Question 3

How many molecules of ATP are hydrolysed to form two molecule of ammonia?

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

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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

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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

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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+

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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

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Question 8

Uridylylation and deuridylylation of PII are brought about by a single enzyme ______________

A. Uridylyltransferase
B. Adenylyltransferase
C. Glutamate synthase
D. Dinitrogenase

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Question 9

Dinitrogenase is a ____________

A. Monomer
B. Dimer
C. Trimer
D. Tetramer

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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

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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

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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

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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

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Question 14

Conversion of nitrogen to ammonia or nitrogenous compounds is termed as ____________

A. Nitrogen fixation
B. Nitrification
C. Denitrification
D. Nitrogen assimilation

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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

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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

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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

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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

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Question 19

Nitrate reduction can be carried out by

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

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