Question

Which of the following structure cannot be taken by the single subunit protein?

• A. Anti-parallel beta sheet
• B. Alpha helix
• C. Tertiary structure
• D. Quaternary structure

Hint:

Quaternary structures are unique to multimeric proteins like hemoglobin, which consist of more than one polypeptide chain.

Answer 1

The Correct Option is D

1. A single subunit protein can form secondary structures like alpha helices and beta sheets, and it can also fold into a tertiary structure.
2. Quaternary structure involves interactions between multiple polypeptide chains, which a single subunit protein cannot achieve.