A protein in tertiary structure shows the formation of the following bonds and interactions that are not seen in secondary structure.A. Hydrogen bonds       B. Ionic bonds                 C. Disulfide bonds                                   D. Peptide bondsE. Hydrophobic interactions                                 F. Van Der Walls interactions

Hydrogen bonds between NH of one amino acid and CO of another amino acid of the same chain are seen in secondary structure. Peptide bonds are present between amino acids in primary and secondary structure. In tertiary structure disulfide linkages are formed between Cysteine residues of polypeptide chain, ionic bonds between acidic and basic amino acids, hydrophobic interactions and Van Der Wall interactions between non-polar amino acids are established in between amino acids of a chain to assume its characteristic conformation for biological activity