Which of the given statement is correct in the context of observing DNA separated by agarose gel electrophoresis? [NCERT Exemplar]
(a) DNA can be seen in visible light
(b) DNA can be seen without staining in visible light
(c) Ethidium bromide stained DNA can be seen in visible light
(d) Ethidium bromide stained DNA can be seen under exposure to UV light
Answers
Answer:
Candidates can download NCERT Exemplar Class 12 Biology Chapter 11 from this page. The exemplar has been provided by the National Council of Educational Research & Training (NCERT) and the candidates can check it from below for free of cost. It contains objective, very short answer type, short answer type, and long answer type questions. Along with it, the answer for each question has also been provided. From the NCERT Exemplar Class 12 Biology Chapter 11, candidates can understand the level and type of questions that are asked in the exam.
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Answer :d
Explanation:
the separated DNA fragments can be visualised only after the staining the DNA with the compound known as ethidium bromide
followed by exposure to ultraviolet radiation ( we cannot see pure DNA fragments in the visible light and without staining ).