Answer
There are two types of secondary structures found in proteins: alpha helix and beta pleated sheet. Both of which are maintained by H bonds formed between the atoms of their polypeptide backbone. On the other hand, the tertiary structure of proteins is stabilized by the bonds between its R groups.
Work Step by Step
Both alpha helix and beta pleated structures in polypeptides are maintained by hydrogen bonds between the carbonyl and amino groups in their backbone. On the other hand, the tertiary structure is stabilized by the multiple interactions between its R groups (e.g. hydrogen bonds, salt bridges).
