What type of interaction would you expect between the following R groups in the tertiary structure of a protein?

Question

Quizplus · Accepted Answer

The R groups in the tertiary structure of a protein are typically involved in hydrophobic interactions, which are the driving force behind the folding of the protein. Disulfide bonds are formed between two cysteine residues and are only found in certain proteins. Salt bridges and hydrogen bonds can be present, but they are usually not the primary forces that hold the protein together. Peptide bonds are not interactions between R groups, but rather the covalent bonds that form the peptide backbone.

What Type of Interaction Would You Expect Between the Following