Protein have primary structure. If you are given a method to know which amino acid is at either of two terminals of a protein, can you connect this Information to purity or homogeneity of protein ?
The primany structure of protein is based on the number type and order of amino add present in the chain. A protein has a linear structure in which the left end of line represents the first and the right end represents the last anino add. The number of amino add in between the two ends determine the purity or homogeneity or proteins