PCR requires
A primer is a sho strand of RNA or DNA (generally about 18-22 bases) that serves as a staing point for DNA synthesisPolymerase chain reaction uses DNA primers because they are more temperature stable. In experiments, it is often impoant to use a primer with a similar Tm to the template strand it will be hybridizing to.Ref: DM Vasudevan, 7th edition, page no: 638
Primer
DNA Polymerase
De-oxyribonucleotide phosphate
Di-oxyribonucleotide phosphate
Metabolism of nucleic acids