The Polymerase Chain Reaction (PCR) is one of the most powerful technologies in molecular biology. The technique allows a small amount of the DNA molecule to be amplified many times, in an exponential manner. It earned Kary Mullis a Nobel Prize for Chemistry in 1993. The award marks the importance of PCR as a key preparatory technique in DNA and RNA analyses. For multiple applications, PCR is an ordinary and often vital practice used in medicinal and biological research labs and is used for diagnosis and investigation of multiple diseases.