Microbial Metabolism
The major route for incorporation of ammonia (NH4+) into organic compounds is via

all of these
atmospheric nitrogen fixation
reduction of pyruvate or alpha-ketoglutarate by enzymes
oxidation of pyruvate

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Microbial Metabolism
The mechanism of passive or facilitated diffusion require

metabolic energy
accumulation or concentration of solute against an electrochemical gradient
accumulation of solute against an electrochemical gradient
concentration of solute against an electrochemical gradient

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