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Which one of the following is wrong statement?

1. Anabaena and Nostoc are capable of fixing nitrogen in free living state also
2. Root nodule forming nitrogen fixers live as aerobes under free-living conditions
3. Phosphorus is a constituent of cell membranes, certain nucleic acids and cell proteins
4. Nitrosomonas and Nitrobacter are chemoautotrophs

Correct answer: Phosphorus is a constituent of cell membranes, certain nucleic acids and cell proteins

Solution

The wrong statement is the one claiming phosphorus is a constituent of cell proteins. Phosphorus is found in phospholipids of membranes and in nucleic acids, but not as a standard structural element of proteins.

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