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In plant, nitrate is reduced to ammonia state in two steps. In second step electrons are donated by
- a)Nitrite reductase
- b)Cytochrome b5
- c)Ferredoxin
- d)Nitrate reductase
Correct answer is option 'C'. Can you explain this answer?
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In plant, nitrate is reduced to ammonia state in two steps. In second ...
Ferredoxins are iron-sulfur proteins that mediate electron transfer in a range of metabolic reactions. The term "ferredoxin" was coined by D.C. he plant-type ferredoxins (Fds) are the [2Fe-2S] proteins that function primarily in photosynthesis; they transfer electrons from photoreduced Photosystem I to ferredoxin NADP(+) reductase in which NADPH is produced for CO(2) assimilation.
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In plant, nitrate is reduced to ammonia state in two steps. In second ...
Reduction of Nitrate to Ammonia in Plants
In plants, the reduction of nitrate to ammonia occurs in two steps. Let's discuss these steps in detail:
Step 1: Reduction of Nitrate to Nitrite
In the first step, nitrate is reduced to nitrite. This reaction is catalyzed by the enzyme nitrate reductase. This enzyme requires electrons from a donor molecule to reduce nitrate to nitrite. The donor molecule in this case is reduced nicotinamide adenine dinucleotide phosphate (NADPH), which is produced during photosynthesis.
Step 2: Reduction of Nitrite to Ammonia
In the second step, nitrite is further reduced to ammonia. This reaction is catalyzed by the enzyme nitrite reductase. This enzyme requires electrons from another donor molecule to reduce nitrite to ammonia. The donor molecule in this case can be one of the following:
1. Ferredoxin: Ferredoxin is a small iron-sulfur protein that acts as an electron carrier in photosynthesis. It can donate electrons to nitrite reductase to reduce nitrite to ammonia.
2. Cytochrome b5: Cytochrome b5 is a heme-containing protein that is involved in electron transfer reactions. It can donate electrons to nitrite reductase to reduce nitrite to ammonia.
Conclusion
In summary, the reduction of nitrate to ammonia in plants occurs in two steps. In the first step, nitrate is reduced to nitrite by nitrate reductase using NADPH as the electron donor. In the second step, nitrite is further reduced to ammonia by nitrite reductase using either ferredoxin or cytochrome b5 as the electron donor.
In plants, the reduction of nitrate to ammonia occurs in two steps. Let's discuss these steps in detail:
Step 1: Reduction of Nitrate to Nitrite
In the first step, nitrate is reduced to nitrite. This reaction is catalyzed by the enzyme nitrate reductase. This enzyme requires electrons from a donor molecule to reduce nitrate to nitrite. The donor molecule in this case is reduced nicotinamide adenine dinucleotide phosphate (NADPH), which is produced during photosynthesis.
Step 2: Reduction of Nitrite to Ammonia
In the second step, nitrite is further reduced to ammonia. This reaction is catalyzed by the enzyme nitrite reductase. This enzyme requires electrons from another donor molecule to reduce nitrite to ammonia. The donor molecule in this case can be one of the following:
1. Ferredoxin: Ferredoxin is a small iron-sulfur protein that acts as an electron carrier in photosynthesis. It can donate electrons to nitrite reductase to reduce nitrite to ammonia.
2. Cytochrome b5: Cytochrome b5 is a heme-containing protein that is involved in electron transfer reactions. It can donate electrons to nitrite reductase to reduce nitrite to ammonia.
Conclusion
In summary, the reduction of nitrate to ammonia in plants occurs in two steps. In the first step, nitrate is reduced to nitrite by nitrate reductase using NADPH as the electron donor. In the second step, nitrite is further reduced to ammonia by nitrite reductase using either ferredoxin or cytochrome b5 as the electron donor.
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In plant, nitrate is reduced to ammonia state in two steps. In second step electrons are donated bya)Nitrite reductaseb)Cytochrome b5c)Ferredoxind)Nitrate reductaseCorrect answer is option 'C'. Can you explain this answer?
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