Question

Match items in List I with items in List II
List I: A. Cytochrome oxidase, B. DNA polymerase, C. Nitrate reductase, D. Urease
List II: I. Molybdenum, II. Nickel, III. Magnesium, IV. Copper

• A. A-IV, B-III, C-I, D-II
• B. A‐IV, B‐III, C‐I, D‐II
• C. A‐III, B‐I, C‐IV, D‐II
• D. A‐II, B‐III, C‐IV, D‐I

Hint:

N/A

Answer 1

The Correct Option is A

A. Cytochrome oxidase \(\rightarrow\) IV. Copper
Cytochrome oxidase is an important enzyme of the electron transport chain. It contains copper (Cu) as a metal cofactor, which helps in electron transfer.

B. DNA polymerase \(\rightarrow\) III. Magnesium
DNA polymerase requires magnesium ions (\(Mg^{2+}\)) for catalytic activity during DNA replication. Magnesium stabilizes the phosphate groups of nucleotides.

C. Nitrate reductase \(\rightarrow\) I. Molybdenum
Nitrate reductase is involved in nitrate assimilation. This enzyme contains molybdenum (Mo) as an essential cofactor.

D. Urease \(\rightarrow\) II. Nickel
Urease catalyzes the breakdown of urea into ammonia and carbon dioxide. It contains nickel (Ni) at its active site.

Therefore, the correct matching is:

\[ A-IV,\; B-III,\; C-I,\; D-II \]