what enzyme is responsible for breaking the hydrogen bonds
RNA polymerase, together with one or more general transcription factors, binds to promoter DNA. RNA polymerase creates a transcription bubble, which separates the two strands of the DNA helix. This is done by breaking the hydrogen bonds between complementary DNA nucleotides. RNA polymerase adds RNA nucleotides (which are complementary to the nucleotides of one DNA strand). RNA sugar-phosphate backbone forms with assistance from RNA polymerase to form an RNA strand.