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Atmospheric nitrogen is converted to ammonia by the enzyme

  • A.Nitrogenase
  • B.Nitrate reductase
  • C.Urease
  • D.Catalase

Answer: A

Nitrogenase is the enzyme complex that reduces atmospheric dinitrogen to ammonia, and it is found only in prokaryotes. Nitrate reductase works in the opposite direction of the cycle, urease releases ammonia from urea, and catalase merely destroys hydrogen peroxide.

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