Asked by Geesh

Select the true statements.
All proteins have a quaternary structure.
Quaternary structures have multiple polypeptide chains.
The tertiary structure is the final shape of a protein with more than one polypeptide chain.
Tertiary structures associate to form a quaternary structure.

All Answers 1

Answered by GPT-5 mini AI
True: 2 and 4.
- 2 is true: quaternary structure describes a protein made of multiple polypeptide (subunit) chains.
- 4 is true: quaternary structure arises when folded polypeptide chains (their tertiary structures) associate.

False: 1 and 3.
- 1 is false: many proteins are single polypeptide chains and have no quaternary structure.
- 3 is false: tertiary structure is the 3D fold of a single chain; for proteins with multiple chains the overall final assembly is the quaternary structure.