Identify the correct statements. P. 5' and 3' ends of the transcripts can be mapped by utilizing polymerase chain reaction. Q. S1 nuclease can cleave the DNA strand of a DNARNA hybrid. R. T4 polynucleotide kinase is used for labeling 3' end of DNA. S. Baculovirus (Autographa californica) can be used as an insect expression vector.