Explain the terms primary and secondary structures of proteins. What is the difference between `alpha`-helix and `beta`-pleated sheet structure of proteins?

Explanation

Primary structure of proteins Proteins consist of one or one or more polypeptide chains. Each polypeptide is a protin contains amino acids joined with each other in a specific sequence. Secodary structure of proteins if refers to the shape in which a long polypeptide chain can exist,
`{:(alpha-"helix structure",beta-"pleated sheet structure"),("A structure of twisting of all a polypeptide chain","All peptide chains are stretched out to nearly"),("formed by possible H-bonds into a right","maximum extension and then laid side by side"),("handed screw (helix) with the -Nh group of","which are held together by intermolecular"),("each amino acid and residue hydrogen","hydrogen bonds. This structure resembles the"),("bonded to the-CO-of an adjacent turn of","plated folds of teh drapery. Hence called"),("the helix.Hence called" alpha-"helix.",beta-"pleated sheet structure"):}`