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
Western blot is used for - 
Select and explain. 
A. DNA, B. RNA, C. Sugar, D. Protein
D: Protein
Answer: D: Protein 
Explanation: Ans. is 'd' i.e., Protein o Visualization of a specific DNA or RNA fragment among the many thousand of contaminating molecules requites 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)