DNA polymerase in PCR (polymerase chain reaction) Can the DNA polymerase in PCR (polymerase chain reaction) recognize both DNA and RNA for use as a template? I want to know is it possible if my primers bind to contaminant RNA and then any DNA polymerase like Taq DNA polymerase use this strand as the template for elongation?

No, this does not happen, as the DNA polymerases used for PCR are DNA dependent. This means that they only synthesize DNA when it is bound to DNA. Even if your primers bind to the RNA, the polymerase will not starting new strands here. To use RNA as a template for PCR you first need to reverse transcribe it.