6. The DNA polymerase enzyme used in PCR is obtained from
(a) Thermusaquaticus
(b) Escherichia coli
(c) Agrobacterium tumefaciens
(d) Salmonella typhimurium
(a) Thermusaquaticus
(b) Escherichia coli
(c) Agrobacterium tumefaciens
(d) Salmonella typhimurium