This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
All of the following types of interactions cooperate in stabilizing the teiary structures of globular proteins except 
Select and explain. 
A. Disulphide bonds, B. Hydrogen bonds, C. Ionic interactions, D. Peptide bonds
D: Peptide bonds
Answer: D: Peptide bonds 
Explanation: Peptide bonds are not involved in stabilizing teiary structure of proteins.It forms the primary structure of proteins. Interactions stabilizing teiary structure of proteins are as follows: Disulfide bonds Hydrophobic interactions Hydrogen bonds Ionic interactions NOTE: Hydrogen bond and Van der waal interactions are involved in the formation of alpha helix(secondary structure) Reference: Harpers illustrated Biochemistry 31st Edition pg 39