Proteins 4.0 / 5 based on 1 rating ? BiologyBiological molecules, organic chemistry and biochemistryA2/A-levelEdexcel Created by: mxllyxsmithhhCreated on: 10-11-19 16:19 2 Amino acids joined together... Dipeptide 1 of 14 3 amino acids joined together... Tipeptide 2 of 14 Lots of amino acids joined together Polypeptide 3 of 14 Polypeptide Chain of amino acids that fold up to form a 3D shape 4 of 14 Primary structure of polypeptide Chain of amino acids in a specific sequence that is determined by how the protein is folded 5 of 14 Secondary structure of a polypeptide Hydrogen bonds form between the amine group of one amino acid and the carboxylic acid group of an amino acid further down the chain 6 of 14 Two ways of folding are... Alpha helix and Beta pleated sheet. Hydrogen bonds hold the polypeptide in that structure. 7 of 14 Tertiary structure of a polypeptide Produces a 3D shaped protein and held together by 3 key bonds between the R groups. 8 of 14 What are the three key bonds between R groups? Hydrogen bonds, Ionic bonds (strong) and disulphide bridges (very strong) 9 of 14 Why is the 3D shape of the protein important? It determines the function of the protein 10 of 14 Quaternary structure of a polypeptide This only occurs if proteins form with more than one polypeptide chain. It refers to the way the polypeptides interlink with each other. 11 of 14 What are the two quaternary structures of proteins? Globular proteins (haemaglobin) and fibrous proteins (collagen) 12 of 14 Describe the structure of collagen Its made up of three polypeptide chains held together by covalent bonds and hydrogen bonds to form a triple helix 13 of 14 Describe the structure of haemaglobin Consists of four polypeptide chains each bound to an iron-containing haem group 14 of 14
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