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12th Grade Nitrogen Metabolism Quizzes, Questions & Answers

12th Grade

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Organic Nitrogen: Ammonia Assimilation Quiz

This assessment focuses on organic nitrogen and the process of ammonia assimilation. It evaluates key concepts such as nitrogen metabolism and enzymatic pathways involved in converting ammonia into organic compounds....

Questions: 15 | Attempts: 10 | Last updated: Mar 18, 2026

Sample Question 1
What is ammonia assimilation and why is it a critical step in nitrogen metabolism

Ammonia assimilation is the excretion of excess ammonium ions from cells to prevent intracellular toxicity

Ammonia assimilation is the abiotic process by which dissolved ammonia in soil water is absorbed into clay mineral structures

Ammonia assimilation is the microbial oxidation of ammonia to nitrite during the first step of aerobic nitrification in soil

Ammonia assimilation is the process by which organisms incorporate inorganic ammonia into organic nitrogen-containing compounds such as amino acids for use in biosynthesis of proteins, nucleotides, and other cellular components

Sample Question 2
What is the reaction catalyzed by glutamine synthetase and why is it important in ammonia assimilation

Glutamine synthetase catalyzes the reduction of nitrate to nitrite using NADH as the electron donor

Glutamine synthetase catalyzes the ATP-dependent condensation of ammonium with glutamate to form glutamine, providing the primary high-affinity route for ammonium incorporation under nitrogen-limiting conditions

Glutamine synthetase catalyzes the reductive amination of alpha-ketoglutarate to glutamate using NADPH as the reductant

Glutamine synthetase catalyzes the transfer of the amide nitrogen from glutamine to alpha-ketoglutarate to produce two molecules of glutamate

Sample Question 3
The GS-GOGAT pathway is the predominant route for ammonia assimilation in bacteria and plants under nitrogen-limiting conditions because it has a higher affinity for ammonium than glutamate dehydrogenase

True

False

12th Grade Nitrogen Metabolism Quizzes, Questions & Answers

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