Winogradsky column question: in the water column there is O2 and many different

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Winogradsky column question: in the water column there is O2 and many different kinds of phototrophic bacteria that use it as an electron acceptor, just like us. give one exams of a group of phototrophic bacteria that are also able to fix elemental nitrogen (N2): Winogradsky column question: in the water column there is O2 and many different kinds of phototrophic bacteria that use it as an electron acceptor, just like us. give one exams of a group of phototrophic bacteria that are also able to fix elemental nitrogen (N2):

Explanation / Answer

Rhizobia are soil bacteria that fix nitrogen (diazotrophs) after becoming established inside root nodules of legumes (Fabaceae). In order to express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen. In general, they are Gram-negative, motile, non-sporulating rods.

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