- sequence of amino acids in the polypeptide chain.
- protien folding.
- held together by hydrogen bonds.
the a helix: wound round to form a helix, held together by hydrogen bonds.
the b sheet: zig zags back and forth forming a sheet, held together by hydrogen bonds.
- compact globular sturcture.
- formed by the folding up of a whole polypeptide chain.
- held togehter by bonds between the R groups.
- arrangement of the different chains.