Nitrogen is a growth- limiting nutrient for many organisms because
A) it is required for lipid synthesis.
B) it is required for synthesis of nucleotides.
C) only a small number of bacteria are able to extract it from the atmosphere.
D) it is necessary for the biosynthesis of amino acids.
E) only a few microbes can extract it from the atmosphere, but all organisms require it for amino acid and nucleotide synthesis.
Correct Answer:
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