The process of copying DNA into mRNA (transcription) is similar to DNA replication in that in both processes, the double helix of DNA has to be unwound first to a certain point to expose the gene and its base sequence required to provide information for either RNA polymerase enzyme to transcribe the information on mRNA, or for DNA polymerase enzyme to be able to read and create a new complimentary strand in DNA replication.
Both transcription and replication are processes which are conducted in the nucleus of the cell.
