Question

Enzyme nitrogenase

• A. Requires 8 ATP for the release of one $H_2$ molecule
• B. Possesses binding sites for $N_2$ and NADH
• C. Is always associated with the oxygen scavenger leghaemoglobin
• D. Is present exclusively in prokaryotes

Answer 1

The correct option is D Is present exclusively in prokaryotes

$N_2+8e^{-}+8H^{+}+16ATP\to 2N{H}_3+H_2+16ADP+16Pi$
Nitrogenase is present only in some bacteria. It uses up 16 ATP molecules and releases one hydrogen molecule. It has binding sites for nitrogen and the reducing agent NADPH. Leghaemoglobin is only found in root nodules of leguminous plants.