This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Structure & Function of Proteins), Subject name: Biochemistry
Strongest interactions among the following - 
Select and explain. 
A. Covalent, B. Hydrogen, C. Electrostatic, D. Van der Waals
A: Covalent
Answer: A: Covalent 
Explanation: Ans. is 'a' i.e., Covalent o Strongest bond Covalento Weakest bond - Van der walls forcesMoleucular interactionso There are two types of interactions between molecules that stabilize molecular structuresCovalent bonds, e.g. peptide bonds and disulphide bonds.ii) Non-covalent bondsMolecular interactionNon-covalent bondsCovalent bondsy Electrostatic interactions (salt bridges or ionic bonds)y Hydrogen bondsy Hydrophobic interactionsy Van Der Waal forces Strength of various interactions (in decreasing order)Covalent (strongest)Q> Electrostatic Q (ionic or salt linkage) > hydrogen> hydrophobic> Van der vvaal's (weakest)Q