what is nitrogen fixation ? Describe the molecular mechanism of biological nitrogen fixation.
Answers
Answer:
Biological nitrogen fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by an enzyme called nitrogenase. The reaction for BNF is: N2 + 8 H+ + 8 e− → 2 NH3 + H2. This type of reaction results in N2 gaining electrons (see above equation) and is thus termed a reduction reaction.
Answer:
The mechanism of biological nitrogen fixation is the process by which nitrogen is converted into a usable form with the help of living organisms. This can be done by free-living bacteria and symbiotic or symbiotic microorganisms. Nitrogen fixation occurs when molecular nitrogen is converted to ammonia.
Explanation:
Biological nitrogen fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by an enzyme called nitrogenase. The reaction of BNF is N2 + 8 H + + 8 e− → 2 NH3 + H2. This type of reaction causes N2 to acquire an electron (see the formula above) and is therefore called a reduction reaction.
Examples of free-living bacteria include Azotobacter and Rhodospirillum. Examples of sympathetic bacteria include Rhizobium (symbiotic with legumes). Certain cyanobacteria, such as Nostoc and Anabaena, help fix nitrogen in this category.
Nostoc and Anabaena can fix nitrogen in the free and symbiotic states, but Rhizobium helps fix nitrogen only in the symbiotic state.
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