<prompt> The enzyme used for the mapping of hypersensitive sites in recombinant DNA research is?DNA ligaseDNA polymerase IDNase IPolynucleotide kinase  <response>: Ans. C. DNase Ia. DNA ligase is used for joining of DNA molecules.b. DNA polymerase I is used for synthesis of double stranded cDNA.c. Polynucleotide kinase is used for T-32 end labeling of DNA or RNA. 