Question

Which of the functional groups shown helps stabilize proteins by forming covalent cross-links within or between protein molecules?

Answer 1

The answer is E. E is a functional group while the rest are part of the peptide backbone. The functional groups are critical in the folding of proteins into secondary, tertiary and quaternary structures that is significant for respective protein functions. Quaternary structures are formed by intermolecular interaction between functional groups of two or more polypeptides.

Answer 2

The sulfhydryl groups are responsible for stabilizing the protein structure. This is achieved by creating covalent bonds between protein molecules.