Which gene names correspond to the enzymes converting nitrate to nitrite and nitrite to nitric oxide?

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Multiple Choice

Which gene names correspond to the enzymes converting nitrate to nitrite and nitrite to nitric oxide?

Explanation:
The two steps in this part of denitrification are carried out by specific reductases: nitrate reductase converts nitrate to nitrite, and nitrite reductase converts nitrite to nitric oxide. The genes that encode these enzymes are Nar for nitrate reductase and Nir for nitrite reductase. So the pair Nar and Nir directly maps to the enzymes performing those conversions. NarK is a transporter, not a reductase, and nitric oxide synthase is a different enzyme not used in this denitrification step.

The two steps in this part of denitrification are carried out by specific reductases: nitrate reductase converts nitrate to nitrite, and nitrite reductase converts nitrite to nitric oxide. The genes that encode these enzymes are Nar for nitrate reductase and Nir for nitrite reductase. So the pair Nar and Nir directly maps to the enzymes performing those conversions. NarK is a transporter, not a reductase, and nitric oxide synthase is a different enzyme not used in this denitrification step.

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