Choose the correct answer from the alternatives given. Which of the following elements is required for the activity of nitrate reductase?
A
Molybdenum
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B
Zinc
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C
Iron
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D
Copper
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Solution
The correct option is A Molybdenum Nitrate reductase (NR) catalyzes the first reaction in nitrate assimilation, the reduction of nitrate to nitrite. Nitrate reductase requires molybdenum ($Mo$) as co-factor. The mechanism involves molybdenum and sulfur-based redox chemistry instead of the currently accepted redox chemistry based only on the Mo ion.