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Question

Which among these elements is required for the action of enzyme nitrogenase an enzyme needed for biological nitrogen fixation?

A
Zn
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B
Mg
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C
Mo
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D
Ca
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Solution

The correct option is A Zn
Biological nitrogen fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by an enzyme called nitrogenase. Many nitrogen-fixing organisms exist only in anaerobic conditions, respiring to draw down oxygen levels, or binding the oxygen with proteins.
So the correct option is 'Zn'.

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