Sequence of amino acids joined by peptide bonds to form a polypeptide chain, Primary structure, Coiled into an alpha helix or folded into a beta pleated sheet by hydrogen bonds, Secondary structure, Folded into a 3D shape via ionic, covalent (disulphide) and hydrogen bonds. Hydrophobic and hydrophillic interactions may also be involved. , Tertiary structure, Two or more polypeptides joined together using the same bonds as the tertiary structure. , Quarternary structure.

Easier - Protein structure

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