In about two hours, a polymerase chain reaction (PCR) can generate millions of copies of a particular DNA sequence. Bypassing the requirement to use microorganisms for DNA amplification, this automated approach. A typical Polymerase Chain Reaction (PCR) is an in vitro technique that enables Taq Polymerase to repeatedly copy a single, small area of a DNA molecule (perhaps a single gene). A researcher can make thousands of identical copies of DNA from a single copy (the template) by utilising a minimal set of reagents and a straightforward heating and cooling cycle (denaturing and annealing). With the discovery of a heat-resistant DNA polymerase from the thermophilic bacterium Thermus aquaticus, the procedure was mechanised (Taq).

Many heating and cooling cycles that would denature DNA polymerases from other species are not enough to inactivate Taq polymerase. Polymerase Chain Reaction (PCR)requires free nucleotides [dNTPs; adenine (A), cytosine (C), guanine (G), and thymine (T)] in an identical molar ratio in addition to the template DNA and the Taq polymerase. Moreover, two distinct single-stranded DNA oligonucleotide (oligo) primers are needed. These primers must anneal to the areas upstream and downstream of the DNA segment that has to be amplified. When these components are mixed in the right buffer, the Taq polymerase may copy the DNA in between the oligo primers by a sequence of heating (denaturing) and cooling (annealing) processes. Via multiple rounds of denaturation, annealing, and synthesis, this molecular biology method converts a few nanograms of template DNA into several micrograms of target DNA. After the Polymerase Chain Reaction (PCR) is finished, gel electrophoresis can be used to confirm the product’s size.

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