(i) A peptide bond is created when two amino acids come together between the amino group of one molecule and the carboxylic acid group of another molecule, a covalent link is created and water is removed.
(ii) The linear arrangement of a protein's amino acid structural building blocks constitutes the fundamental structure of a peptide. From the amino-terminal (N) end to the carboxyl-terminal (C) end, a protein's main structure is described.
(iii) Denaturation, the process by which proteins or nucleic acids lose the quaternary, tertiary, and secondary structures that are present in their natural condition through the application of some external stress or substance, such as a potent acid or base, an inorganic salt that has been concentrated, or an organic sol.