Question

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

• A. A-IV, B-III, C-II, D-I
• 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:

Quick pairs: Urease-Ni, Nitrate Reductase-Mo, Polymerase-Mg.

Answer 1

The Correct Option is B

Step 1: Concept
Many enzymes require metal ions as cofactors to function or stabilize their structure.

Step 2: Meaning
Specific enzymes have characteristic metal requirements.

Step 3: Analysis
- Cytochrome oxidase contains Copper (IV) and Iron. - DNA polymerase requires Magnesium (III) ions for catalysis. - Nitrate reductase is a well-known Molybdenum (I) containing enzyme. - Urease was the first enzyme shown to contain Nickel (II).

Step 4: Conclusion
Matching the pairs: A-IV, B-III, C-I, D-II. Final Answer: (B)