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Which one of the following is wrong statement about nitrogen fixing?

Which one of the following is wrong statement about nitrogen fixing?

Options

(a) Anabaena and Nostoc are capable of fixing nitrogen in free living state also.
(b) Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
(c) Phosphorus is a constituent of cell membranes, certain necleic acids and cell proteins
(d) Nitrosomonas and Nitrobacter are chemoautotrophs.

Correct Answer:

Phosphorus is a constituent of cell membranes, certain necleic acids and cell proteins

Explanation:

Phosphorus is a constituent of nucleic acids both DNA and RNA but absent cell memebranes and cell proteins.

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