Which of the following type of bond is not present in the teiary structure of protein?

Teiary structure of a protein results from hydrogen bonding, di sulfide linkage, ionic bonds between polar amino acids, and interaction between hydrophobic R groups. Teiary structure of a protein develops after the secondary structure is established. It refers to how the amino acid chain bends or fold in three dimension to form a compact or tightly folded protein. Hemoglobin is a protein that clearly demonstrates teiary structure. The primary structure is determined genetically as the paicular sequence of amino acids in a given protein. Secondary structure is the local conformation of a protein molecule. It is due to formation of hydrogen bonds, disulfide bridges and ionic bonds between adjacent or nearby amino acid in an amino acid chain. Ref: CRC Desk Reference for Nutrition, Second Edition By Carolyn D. Berdanier page 356.