24.1 Nitrogen Fixation: Microorganisms Use ATP and a Powerful Reductant to Reduce Atmospheric Nitrogen to Ammonia
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24.2 Amino Acids Are Made from Intermediates of the Citric Acid Cycle and Other Major Pathways
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24.3 Feedback Inhibition Regulates Amino Acid Biosynthesis
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24.4 Amino Acids Are Precursors of Many Biomolecules
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