A) Phosphorus is a constituent of cell mem- branes, certain nucleic acids and all proteins
B) Nitrosomonas and Nitrobacter are chemoautotrophs
C) Anabaena and Nostoc are capable of fixing nitrogen in free-living state also
D) Root nodule forming nitrogen fixers live as aerobes under free living conditions
Correct Answer: A
Solution :
Phosphorus is a constituent of nucleic acids in both DNA and RNA but absent in cell membranes and cell proteins.
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