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Biochemistry

Study Pack

Set 23 Nitrogen Acquisition And Amino Acid Metabolism

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Question 1

(Multiple Choice)

Free
Which of the following explains why animals totally dependent on plants and microorganisms for nitrogen fixation and nitrate assimilation?

A)They lack the enzyme aminotransferase.
B)They lack the enzymes to reduce N₂ and NO₃- to NH₄⁺.
C)They lack carbamoyl-phosphate synthetase I.
D)They lack glutamate dehydrogenase.

Answer

Question 2

(Multiple Choice)

Free
Which of the following describes the role ATP plays in the nitrogenase complex?

A)breaks the N₂ triple bond
B)provides electrons
C)phosphorylates the enzyme
D)transfers electrons from ferredoxin

Answer

Question 3

(Multiple Choice)

Free
Which of the following describes the role of N-acetylglutamate in the incorporation of ammonium into metabolic intermediates?

A)coenzyme for glutamine synthetase (GS)
B)competitive inhibitor for glutamine synthetase (GS)
C)allosteric activator for carbamoyl-phosphate synthetase I (CPS-I)
D)substrate for the amination of the g-glutamyl-phosphate

Answer