Biotechnology - Principle question bank (Zoology)

Refer to the following statements for agarose-gel electrophoresis : (a) Agarose is a natural polymer obtained from sea-weed. (b) The separation of DNA molecules in agarosegel electrophoresis depends on the size of DNA. (c) The DNA migrates from negatively-charged electrode to the positively-charged electrode (d) The DNA migrates from positively-charged electrode to the negatively-charged electrode. Choose the most appropriate answer from the options given below :

Given below are four statements pertaining to separation of DNA fragments using gel electrophoresis. Identify the incorrect statements. 1. DNA is negatively charged molecule and so it is loaded on gel towards the anode terminal. 2. DNA fragments travel along the surface of the gel whose concentration does not affect movement of DNA. 3. Smaller the size of DNA fragment larger is the distance it travels through it. 4. Pure DNA can be visualised directly by exposing UV-radiation. Select the correct option from the following