<prompt> Nohern blot test is used for:DNA analysisRNA analysisAnalysis of proteinsEnzyme analysis  <response>: B i.e. RNA analysis - Blotting techniques separate fragments on the basis of their mass size by agarose or SDS- polyacrylamide gel electrophoresis SDS-PAGE and then transfer the pattern to nitrocellulosenylon paper blotting or adsorption. Then enzymeradioactiveor fluorescence labeled probe is added complementing, hybridizing detecting the desired fragment. Southern blotting, Nohern blotting and Western blotting techniques Mn - See No West are used respectively to analyze DNA, mRNA and proteins sampleQ sequence of protein synthesis. And the probes used in these techniques are c-DNA, cDNA and antibody respectively. - Antigen-antibody reaction is detected by ELISA enzyme linked immune sorbent assay and Western immuno blot. ELISA is sensitive and Western blot is confirmatory in AIDS diagnosisQ 