<prompt> Nohern blotting is used for the separation of:DNARNAProteinsNone of the above  <response>: Nohern blotting is used to separate RNA. Nohern blotting allows researchers to determine the level of production and, therefore, control of expression of a paicular mRNA by quantitative determination of the relative amount of that paicular mRNA relative to total mRNA. Southern blotting is used to identify and isolate a specific DNA sequence and can also quantitatively determine the number of times a specific sequence occurs in a paicular cell type. Western blotting is used to separate proteins. Ref: The Big Picture: Medical Biochemistry Lee W. Janson, Appendix II 