Final answer:
The types of interactions that lead to tertiary structure of proteins include hydrophobic interactions, ionic bonding, hydrogen bonding, and disulfide linkages.
Step-by-step explanation:
The tertiary structure of proteins is determined by four major types of attractive interactions: hydrophobic interactions, ionic bonding, hydrogen bonding, and disulfide linkages. These interactions play a crucial role in shaping and stabilizing the protein's three-dimensional structure.