section_path: RNA genomes/In reverse transcription
section_name: In reverse transcription
paragraph_text: In reverse transcription
  
  Reverse transcribing viruses replicate their genomes by reverse transcribing DNA copies from their RNA; these DNA copies are then transcribed to new RNA. Retrotransposons also spread by copying DNA and RNA from one another, and telomerase contains an RNA that is used as template for building the ends of eukaryotic chromosomes.