(19) D. All of the choices are correct. Explanation: enzymes. ; fluorescent dyes. ; radioisotopes. (20) C. Proteins Western Blot is a common method to detect and analyze proteins. (21) e. Specific genetic marker sequence on genes Fluorescence in situ hybridization is a way to visualize specific sequence on genes. (22) a. DNA to DNA A Southern blot is used for detection of a specific DNA sequence in DNA samples. It uses labelled DNA probe to detect DNA sequence. (23) a. Hybridize Solution (19) D. All of the choices are correct. Explanation: enzymes. ; fluorescent dyes. ; radioisotopes. (20) C. Proteins Western Blot is a common method to detect and analyze proteins. (21) e. Specific genetic marker sequence on genes Fluorescence in situ hybridization is a way to visualize specific sequence on genes. (22) a. DNA to DNA A Southern blot is used for detection of a specific DNA sequence in DNA samples. It uses labelled DNA probe to detect DNA sequence. (23) a. Hybridize.