How and why is the bacterium Thermus aquaticus employed in recombinant DNA technology? Explain.

A thermostable DNA called polymerase Taq polymerase is isolated from Thermus aquaticus bacterium. The Taq polymerase carries out the polymerisation of the DNA strands during polymerase chain reaction amplification cycle of recombinant DNA technology. The optimum temperature for this polymerization reaction is 72 $°$C. Taq polymerase remains stable at this temperature and is thus used in PCR amplification cycle of recombinant DNA technology.