alleryThe enzyme used by NITROGEN-FIXING bacteria to convert N₂ to NH3 is:
ANitrate reductase (a different enzyme)
BNitrogenase (key N-fixation enzyme)
CRuBisCO (involved in photosynthesis)
DATP synthase (makes the ATP)
Answer & Solution
Correct answer: B. Nitrogenase (key N-fixation enzyme)
**NITROGENASE:** the enzyme complex (Mo + Fe co-factor) that catalyses N₂ + 8H+ + 8e⁻
→ 2NH3 + H₂. Sensitive to O₂.
Found in Azotobacter, Clostridium, Rhizobium, cyanobacteria.
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