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This video Contain most important questions about Polymerase Chain Reaction. Polymerase chain reaction (PCR) is a method widely used to rapidly make millions to billions of copies of a specific DNA sample, allowing scientists to take a very small sample of DNA and amplify it to a large enough amount to study in detail. This Video is very useful for all competitive exams such as PPSC, Neet , UPSC, Railway, AIIMS .