Solve & explain briefly

Solve & explain briefly Which of the following gene clusters in bacte- ria is responsible for nitrogen fixation ? 411 nod, nif, fix (3) nod, nix, nfx nod, ndf, nfx ndx, nif, fix

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Please find below the solution to the asked query       
          
Option (a) is correct.
nod (nodulation),nif (encode nitrogenase enzyme) and fix- gene cluster in bacteria is responsible for nitrogen fixation.

A Gene cluster comprises two or more genes that code for similar king of proteins in an organism.

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