Which of the following statements about nitrogenase catalysis is true? A) ATP hy

Question

Which of the following statements about nitrogenase catalysis is true? A) ATP hydrolysis is used to drive the thermodynamically unfavorable cleavage of N2 B) ATP binding is used to improve the thermodynamic potential for electron transfer C) ATP binding to the dinitogena subunit promotes splitting of the triple bond in N2 D) ATP hydrolysis is used to maintain the association of dinitrogenase and dinitrogenase reductase subunits E) Reduction of pyruvate provides the electrons needed to drive formation of ammonium ions

Explanation / Answer

The true statement is D

ATP hydrolysis is used to maintain the association of dinitrogenase and dinitrogenase reductase subunits.

nitrogenase contain two proteins,1)reductase :it provides electron with high reducing power(2)nitrogenase :it uses these electrons to reduce nitrogen to ammonia.The transfer of electron from reductase to nitrogenase component is coupled to the hydrolysis of ATP by the reductase.

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