This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': "Which of the following type of bond is not present in the teiary structure of protein? \nSelect and explain. \nA. Hydrogen bonds, B. Disulphide bonds, C. Salt linkage, D. Vander Waal's bonds", 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]