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BCH 301David Umahi Federal University of Health SciencesNov 2, 2026

DR OKORO BCH 301 NITROGEN METABOLISM

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  • Nitrogen Metabolism: Core Concepts

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Q1.Which metabolic intermediate serves as the direct carbon skeleton donor for the largest family of amino acids in biosynthetic classification?

A3-Phosphoglycerate
BOxaloacetate
CPyruvate
Dα-Ketoglutarate

Q2.What is the primary biochemical function of leghemoglobin within root nodules during active nitrogen fixation?

ADirect reduction of N₂ to NH₃ using ATP and ferredoxin
BOxygen scavenging to maintain anaerobic conditions for nitrogenase
CSynthesis of nodulin proteins for nodule structural integrity
DCatalytic conversion of ammonia to glutamate via GS-GOGAT

Q3.Which quantitative contribution to global nitrogen fixation most accurately reflects the relative magnitude of biological versus abiological industrial processes?

AIndustrial fixation exceeds biological fixation by approximately 2-fold
BFree-living bacteria such as Azotobacter contribute more than symbiotic systems
CBiological nitrogen fixation contributes roughly 60% of the global total
DLightning and UV radiation together account for more than half of total fixation

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