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(a) Why is Taq polymerase used instead of ordinary DNA polymerase in polymerase chain reaction (PCR) ? Name the source organism of Taq polymerase.
(b) What is PCR used for ?

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(a) It is thermostable / remains active during the high temperature induced denaturation of (double stranded) DNA , (bacterium) Thermus acquaticus 
(b) To obtain multiple copies of the gene (or DNA) of interest

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