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Nitrogenase Is Diagrammed Below

Question 43

Multiple Choice

Nitrogenase is diagrammed below. This particular enzyme is shown in the format just before it begins a cycle of nitrogen reduction. This goal is accomplished in four steps. What is the first step? Nitrogenase is diagrammed below. This particular enzyme is shown in the format just before it begins a cycle of nitrogen reduction. This goal is accomplished in four steps. What is the first step?   A)  N<sub>2</sub> gas binds to the active site on the FeMo protein. B)  NADPH binds to the active site in order to reduce it prior to N<sub>2</sub> binding. C)  Two e<sup> - </sup>are transferred to the Fe protein and then to the FeMo protein, which are used to reduce H<sup><sup><sup>+</sup></sup></sup> to H<sub>2</sub> prior to N<sub>2 </sub>binding. D)  The preexisitng NH<sub>4</sub>+ is removed prior to N<sub>2</sub> binding. E)  Fe and Mo are bound to the active sites and then released prior to the next cycle.


A) N2 gas binds to the active site on the FeMo protein.
B) NADPH binds to the active site in order to reduce it prior to N2 binding.
C) Two e - are transferred to the Fe protein and then to the FeMo protein, which are used to reduce H+ to H2 prior to N2 binding.
D) The preexisitng NH4+ is removed prior to N2 binding.
E) Fe and Mo are bound to the active sites and then released prior to the next cycle.

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