Which one of the following is a wrong statement?

  • A
    $Anabaena$ and $Nostoc$ are capable of fixing nitrogen in a free-living state also.
  • B
    Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
  • C
    Vitamin is a constituent of cell membranes,certain nucleic acids,and cell proteins.
  • D
    $Nitrosomonas$ and $Nitrobacter$ are chemoautotrophs.

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