PCR requires: (A) Primer, (B) DNA Polymerase, (C) De-oxyribonucleotide phosphate, (D) Di-oxyribonucleotide phosphate
Answer is A. 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