First slide
Metabolism of Nitrogen
Question

Identify the free living and anaerobic nitrogen fixer.

Easy
Solution

Rhodospirillum is anaerobic and free-living nitrogen fixer. 
Azotobacter and Beijerinckia are free-living nitrogen-fixing aerobic microbes. 
Cyanobacteria such as Anabaena and Nostoc are also free-living nitrogen-fixers. The cells of Anabaena and Nostoc shows metabolic compartmentalization only at the site where the enzyme nitrogenase is present. 

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