_ arises only when a protein consists of two or more polypeptide chains?
Correct answer: D. Quaternary structure
- A. Primary structure
- B. Secondary structure
- C. Tertiary structure
- D. Quaternary structure
Explanation
The correct answer is the quaternary structure because it specifically refers to the level of protein structure where multiple polypeptide chains, or subunits, associate to form a single functional protein complex. The other options refer to structural levels involving only a single polypeptide chain: the primary structure is the linear sequence of amino acids, the secondary structure involves local folding such as helices and sheets, and the tertiary structure is the overall 3D shape of a single chain.
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