Which of the following has popularised the PCR (Polymerase Chain Reaction)?
1. Easy availability of DNA template
2. Availability of synthetic primers.
3. Availability of cheap deoxyribonucleotides
4. Availability of ‘Thermostable’ DNA polymerase

Which of the following steps are catalysed by Taq DNA polymerase in a PCR reaction?
1. Denaturation of template DNA
2. Annealing of primers to template DNA
3. Extension of primer end on the template DNA
4. All of the above

Who among the following was awarded the Nobel Prize for the development of the PCR technique?

1. Herbert Boyer                                   
2. Hargovind Khurana
3. Kary Mullis                                       
4. Arthur Kornberg