General Science • BiologyMedium
What is the primary biochemical role of the enzyme nitrogenase found in the root nodules of leguminous plants?
A. Conversion of nitrates into atmospheric nitrogen gas
B. Reduction of atmospheric nitrogen gas into ammonia✓ Correct Answer
C. Oxidation of ammonium ions into nitrites
D. Fixation of carbon dioxide during dark reactions
💡 Solution & Explanation
The nitrogenase enzyme complex found within the root nodules of leguminous plants is responsible for biological nitrogen fixation by reducing atmospheric nitrogen gas into ammonia. Plants cannot utilize atmospheric nitrogen directly because of its strong triple covalent bond, making nitrogenase essential for converting it into a bioavailable form. This enzyme is highly oxygen-sensitive and operates effectively in conjunction with the oxygen-scavenging pigment leghemoglobin.
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