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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