Nitrogen fixation:
A. is necessary for the electron-transport
chain because nitrogen acts as the final
electron acceptor.
B. incorporates molecular nitrogen (N2) taken
from the air into amino acids and nucleotides.
C. releases N2 gas to the atmosphere.
D. converts N2 to ammonia, making it
available for incorporation into amino acids
and nucleotides.
E. is carried out by biochemical pathways in
the plant cells.
D
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