alleryStart learning →What is the quaternary structure of a protein?
AThe order of amino acids within one single chain
BThe local folding of one chain into helices and sheets
CThe way one chain folds into its final overall shape
DThe association of several polypeptide subunits
Answer & Solution
Correct answer: D. The association of several polypeptide subunits
1. Some proteins are formed from several polypeptides, which are known as subunits.
2. The interaction of those subunits forms the quaternary structure.
3. Weak interactions between the subunits help stabilise the overall structure.
4. This level is optional, since a protein made of one chain stops at tertiary structure.
5. Silk shows the idea clearly, since its beta pleated sheet results from hydrogen bonding between different chains.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 3 "Biological Macromolecules", section 3.4 Proteins_
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