RNA polymerase and DNA helicase

2018-05-24 11:55:19

Is DNA helicase or RNA polymerase responsible for breaking the hydrogen bond between the 2 strands during transcription? My textbook says it is DNA helicase that breaks the hydrogen bonds while RNA polymerase catalyses the formation of bonds between RNA nucleotides. However, when I searched online, many sources say that RNA polymerase is capable of breaking hydrogen bonds. Then do RNA polymerase break hydrogen bonds? If RNA polymerase can break hydrogen bonds between strands then what is the role of DNA helicase in the transcription process?