Nif genes are a group of:

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(A) The $nif$ genes (nitrogen fixation genes) are a cluster of genes found in many bacteria,such as $Klebsiella\; pneumoniae$ and $Azotobacter$,that a

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$15$ genes

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(A) The $nif$ genes (nitrogen fixation genes) are a cluster of genes found in many bacteria,such as $Klebsiella\; pneumoniae$ and $Azotobacter$,that are responsible for nitrogen fixation.These genes encode the enzymes required for the reduction of atmospheric nitrogen $(N_2)$ into ammonia $(NH_3)$.The $nif$ gene cluster in $Klebsiella\; pneumoniae$ consists of $17$ genes organized into $7$ or $8$ operons,but historically and in many textbook contexts,it is often referred to as a group of $15$ genes involved in the nitrogenase complex and its regulation.Therefore,the most appropriate answer among the given options is $15$ genes.

Similar Questions

Choose the incorrect pair$(s)$:
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$(II)$ Rhodospirillum - Aerobic microbes
$(III)$ Bacillus - Free-living
$(IV)$ Cyanobacteria - Anabaena and Azotobacter

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