Answer:
Tertiary structure
Step-by-step explanation:
Tertiary structure can be described as the overall three-dimensional structure of the protein. Interactions between amino acid side chains (R-groups of amino acids) in protein determine its tertiary structure. These interactions play an important role in stabilizing 3-D protein structure and they involve: ionic bonds, hydrogen bonds, van der Waals interactions, covalent bonds, and hydrophobic interactions.