Which of the following pairs represents free-living,nitrogen-fixing,aerobic bacteria?

  • A
    Rhizobium and Frankia
  • B
    Azotobacter and Beijerinckia
  • C
    Anabaena and Rhodospirillum
  • D
    Pseudomonas and Thiobacillus

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Which of the following bacteria are free-living nitrogen fixers?

$Azotobacter$ is a.......

$N_2 + 8e^- + X + 16 ATP \rightleftharpoons 2NH_3 + Y + 16 ADP + 16 Pi$

The free-living anaerobic nitrogen-fixing bacterium is . . . . . . .

Which enzyme is involved in nitrogen metabolism?

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