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Describe the four structures of protein.
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Describe the four structures of protein. Like Carbohydrates and lipids, proteins contain the elements carbon (c), Hydrogen (h) and Oxygen (O), but in addition they also always contain Nitrogen (N). Sulphur is often present as well as iron and phosphorous. But before understanding how proteins are constructed, the structure of amino acids should be noted. The diagram below shows the general structure of amino acids. A reaction takes place between the amino group of one amino acid and the carboxyl group of another. A molecule of water (H2O) is removed in a condensation reaction. A peptide bond is formed. When two amino acids join a dipeptide is formed. Further condensation reaction can take place resulting in the addition of other amino acids to form a chain called a polypeptide. There are four levels of structure found in polypeptides and proteins. The primary structure of a polypeptide of protein determines...
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