S - Statement: The presence of Zn is essentia | vedclass

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(C) Statement $S$ is true because carbonic anhydrase is a zinc-containing enzyme that catalyzes the interconversion of $CO_2$ and $HCO_3^-$.Statement

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$S$ is true and $R$ is false.

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(C) Statement $S$ is true because carbonic anhydrase is a zinc-containing enzyme that catalyzes the interconversion of $CO_2$ and $HCO_3^-$.Statement $R$ is false because nitrogenase is a molybdenum-iron $(Mo-Fe)$ protein complex,not a vanadium-dependent enzyme in the context of standard biological nitrogen fixation. While some alternative nitrogenases exist,the primary nitrogenase enzyme is $Mo-Fe$ dependent.Therefore,$S$ is true and $R$ is false.

Column-$I$	Column-$II$
$(a)$ Calcium	$(p)$ Ferredoxin
$(b)$ Phosphorous	$(q)$ $N_2$-metabolism
$(c)$ Iron	$(r)$ Meristematic tissue
$(d)$ Manganese	$(s)$ Cell membrane

$S$ - Statement: The presence of $Zn$ is essential for the activity of carbonic anhydrase.
$R$ - Reason: The presence of vanadium is essential for the activity of nitrogenase.

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Column-$I$ Column-$II$

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$S$ - Statement: The presence of $Zn$ is essential for the activity of carbonic anhydrase.$R$ - Reason: The presence of vanadium is essential for the activity of nitrogenase.