Final answer:
Tertiary protein structures are formed through interactions between different secondary structures. These interactions include hydrogen bonding, Vanderwall forces, and disulfide bonds.
Step-by-step explanation:
Tertiary protein structures are formed when several secondary structures come together.
In addition to hydrogen bonding, amino acid side chains of the various secondary structures start interacting with each other in a number of ways. Some of these interactions include Vanderwall forces, disulfide bonds, and more.
Disulfide bonds are covalent bonds between sulfur atoms in a polypeptide. These bonds are formed between cysteine amino acids that have sulfur-containing side chains.
Vanderwall forces are weak attractive forces that occur between nonpolar side chains in the protein. These forces allow hydrophobic amino acids to interact with each other, promoting protein folding.