A) Cu
B) \[Mo\]
C) Ni
D) \[M{{n}^{2+}}\]
Correct Answer: B
Solution :
Biological nitrogen fixation is carried out by a highly conserved complex of proteins called the nitrogenase complex, the key components of which are dinitrogenase reductase and dinitrogenase. Dinitrogenase reductase (\[{{M}_{r}}\] 60,000) is a dimer of two identical subunits. It contains a single 4Fe-4S redox centre and can be oxidised and reduced by one electron. It also has two binding sites for ATP/ADP. Dinitrogenase (\[{{M}_{r}}\] 2, 40, 000), a tetramer with two copies of two different subunits, contains both iron and molybdenum; its redox centres have a total of 2 Mo, 32 Fe and 30 S per tetramer. About half of the Fe and S is present as two bridged pairs of 4Fe-4S centres called P-clusters; the remainder is present as part of a novel iron-molybdenum cofactor. Nickel (Ni) is a component of enzyme urease. James Sumner (1926) isolated and crystallised the enzyme urease. Copper (Cu) is a component of cytochrome oxidase. Final step of respiratory chain also called as cytochrome oxidase. It is large enzyme (13 subunits \[{{M}_{r}}\] 2, 04, 000) of the inner mitochondrial membrane.
You need to login to perform this action.
You will be redirected in
3 sec
