Answer :

Final answer:

The polymerase used in PCR must be thermostable to withstand the high temperatures during the DNA amplification cycles, with Taq polymerase from Thermus aquaticus being a common choice due to its high temperature tolerance.

Explanation:

The special characteristic that polymerase used in PCR (polymerase chain reaction) must possess is the ability to withstand high temperatures. Taq polymerase is a DNA polymerase isolated from the thermostable bacterium Thermus aquaticus, which can endure the high temperatures typically used during the PCR process.

During PCR, the mixture goes through cycles of heating and cooling, which are necessary to separate the DNA strands and synthesize new strands. A polymerase that denatures at these temperatures would be rendered inactive and unable to complete the process. Therefore, the use of a thermostable enzyme like Taq polymerase is crucial for the amplification of DNA.

Moreover, high-fidelity is another essential requirement for a polymerase used in PCR. It must accurately replicate the DNA sequence with minimal errors.

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