Question

When a protein has two or more polypeptide subunits, their folding arrangement is called:

• A. Primary structure
• B. Secondary structure
• C. Tertiary structure
• D. Quaternary structure

Hint:

Quaternary = ”Q for Quartet,” referring to multiple subunits forming a functional complex.

Answer 1

The Correct Option is D

Quaternary structure describes the arrangement and interactions of a protein's multiple polypeptide subunits within a single complex. Hemoglobin and collagen are key examples.