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Read the following statements (i) Prim...

Read the following statements
(i) Primers used in PCR are small chemically synthesised oligosaccharides
(ii) E. coli is closely related to Salmonella
(iii) There are 3 basic steps in genetically modifying an organism
(iv) The techniques of the genetic engineering overcome the limitation of traditional hybridisation procedures.
In these statements how many are correct

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