This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Biology Techniques, Subject name: Biochemistry
Northern blot is used to detect - 
Select and explain. 
A. Protein, B. Immunoglobulin, C. RNA, D. DNA
C: RNA
Answer: C: RNA 
Explanation: 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).