Read the following statements and choose the correct option: 1. Electrophoresis is a technique used for the separation of molecules based on their size and charge 2. Plasmids are extra chromosomal, self-replicating, usually circular, double stranded DNA molecules found naturally in many bacteria and also in some yeast 3. It is not advisable to use an exonuclease enzyme while producing a recombinant DNA molecule 4. In

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The first restriction endonuclease–Hind II, whose functioning depended on a specific DNA nucleotide sequence was isolated and characterised five years later. It was found that Hind II always cut DNA molecules at a particular point by recognising a specific sequence of six base pairs. This specific base sequence is known as the recognition sequence for Hind II. Besides Hind II, today we know more than 900 restriction enzymes that have been isolated from over 230 strains of bacteria each of which recognise different