Question

Match the proteins with their functions:

List I	List II
A. Insulin --- II. Hormone B. Collagen --- III. Intercellular ground substance C. Antibody --- IV. Fights infection agents D. Trypsin --- I. Enzyme	II. Hormone III. Intercellular ground substance IV. Fights infection agents I. Enzyme

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

Hint:

Insulin = hormone; Collagen = structural protein; Antibody = immune defence; Trypsin = digestive enzyme.

Answer 1

The Correct Option is C

Step 1: Concept
Protein functions in biological systems.

Step 2: Meaning
Proteins perform diverse structural, enzymatic, hormonal, and immunological roles.

Step 3: Analysis
Insulin (A): Polypeptide hormone that regulates blood glucose --- matches II.
Collagen (B): Structural protein forming intercellular ground substance in connective tissue --- matches III.
Antibody (C): Immunoglobulin that fights infection agents --- matches IV.
Trypsin (D): Serine protease enzyme --- matches I.

Step 4: Conclusion
Correct matching: A-II, B-III, C-IV, D-I. Final Answer: (C)