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A Reverse transcriptase (RT) is an enzyme used to generate complementary DNA (cDNA) from an RNA template, a process termed reverse transcription.It is mainly associated with retroviruses.elomerase is another reverse transcriptase found in many eukaryotes, including humans, which carries its own RNA template; this RNA is used as a template for DNA replication.
While not all the DNA in today's archaea is found in positive supercoils, reverse gyrase is found not only in thermophilic archaea, but in some species of mesophilic archaea, indicating that perhaps it was present in the common ancestor of all archaea.