Home Biology The Living World Previous Year Questions Which one of the following is wrong statemen…
Biology The Living World Previous Year Questions Single Correct MCQ
Published on: August 13, 2026

Which one of the following is wrong statement?

A
Phosphorus is a constituent of cell membranes, 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

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The correct answer is:
A

Phosphorus is present in nucleic acids (DNA, RNA) and cell membranes (phospholipids). However, it is not a constituent of all proteins, so the statement is wrong. Nitrosomonas and Nitrobacter are chemoautotrophic nitrifying bacteria.

Anabaena and Nostoc can fix nitrogen in free-living state. Root nodule bacteria live aerobically in free-living condition.

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