question_answer 16)

  Which of the given statement is correct in the context of observing DNA separated by agarose gel electrophoresis? (a) DNA can be seen in visible light. (b) DNA can be seen without staining in visible light. (c) Ethidiurn bromide stained DNA can be seen in visible light. (d) Ethidium bromide stained DNA can be seen under exposure to UV light.

Answer:

                  the separated DNA fragments (by the process of gel electrophoresis) are visualized after staining the DNA with ethidium bromide followed by exposure to UV-radiation. These fragments are seen as orange coloured bands.