Given the task definition and input, reply with output. In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

A reverse transcriptase is an enzyme which works ' backwards ' from RNA to DNA .

A reverse transcriptase ( RT ) is an enzyme used to generate complementary DNA ( cDNA ) from an RNA template , a process termed " reverse transcription " .