Quaternary structure is found in:
Correct answer: A. Haemoglobin
- A. Haemoglobin
- B. Insulin
- C. Keratin
- D. Fibrin
Explanation
The quaternary structure of a protein involves multiple polypeptide chains coming together to form a functional unit. Haemoglobin is an example of a protein with quaternary structure, as it consists of four polypeptide subunits working together to transport oxygen in the blood. In contrast, insulin, keratin, and fibrin do not exhibit the classical quaternary structure characterized by multi-subunit complex formation. Insulin has two chains but does not form a typical quaternary complex, keratin is primarily known for its secondary structure, and fibrin's function in clotting is a result of polymerization rather than quaternary structure.
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