<prompt> Northern blot is used to detect -ProteinImmunoglobulinRNADNA  <response>: Ans. is c i.e., RNA o Visualization of a specific DNA or RNA fragment among the many thousand of contaminating molecules requires the convergence of number of techniques collectively termed the blot transfer.Southern blot - Detects DNANorthern blot - Detects RNAWestern blot -Detects proteins proteins are separated by electrophoresis, renatured and analysed for an interaction by hybridization with a specific labelled DNA probe. 