Which one of the following is wrong statement

Options

A. Nitrosomonas and Nitrobacter are chemoautotrophs
B. Anabaena and Nostoc are capabls of fixing nitrogen in free - living state also .
C. Root nodule forming nitrogenfixers live as aerobes under free - living conditions .
D. Phosphorous is a constituent of cell membranes, certain mucleic acids and all proteins.

Answer

D