Question

(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 ?

Answer 1

(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