Gene responsible for nitrogen fixation is

Nif

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Nitrogenase

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Yeast alanine tRNA synthetase

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RNA synthetase

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Solution

The correct option is B Nif
Nif genes are the genes present in nitrogen -fixing bacteria encoding for the enzymes involved in nitrogen fixation i.e., nitrogenase, nitrate reductase, nitrite reductase.
All the other options given are the names of enzymes not gene.
Hence, A is the right answer.

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