NEET Biology question

Not in NEET syllabus

Which of the following elements most directly supports the functioning of nitrogenase during biological nitrogen fixation, via the Mg-ATP complex required to energise the reaction?

(A)Cu2+
(B)Zn2+
(C)Mg2+Correct
(D)Mn2+

Answer: (C)

Solution

Nitrogenase catalyses an extremely energy-demanding reaction, consuming 16 ATP molecules for every N2 molecule reduced; like essentially all ATP-utilising enzymes, it requires Mg2+ bound to ATP (as the biologically active Mg-ATP complex) for catalysis. Copper and zinc have no

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Question ID VK-112847