Sometimes it is impossible to classify organism using morphological criteria, so one resorts to comparing the chemical substance which they contain.
This is particularly useful when classifying organism like bacteria which may all look alike and have an identical cellular structure. Using techniques such as chromatography and electrophoresis, it is possible to compare the amino acid sequence in the proteins of different organism, or the order of bases in their DNA. This is useful not only in classifying organism, but is indispensable when trying to establish evolutionary relationship.
This is particularly useful when classifying organism like bacteria which may all look alike and have an identical cellular structure. Using techniques such as chromatography and electrophoresis, it is possible to compare the amino acid sequence in the proteins of different organism, or the order of bases in their DNA. This is useful not only in classifying organism, but is indispensable when trying to establish evolutionary relationship.
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