Editing Messenger RNA (section)

===Transcription===
{{main|Transcription (genetics)}}
Transcription is when RNA is copied from DNA in the nucleus. During transcription, [[RNA polymerase]] makes a copy of a gene from the DNA to mRNA as needed. This process differs slightly in eukaryotes and prokaryotes. One notable difference is that prokaryotic RNA polymerase associates with DNA-processing enzymes during transcription so that processing can proceed during transcription. Therefore, this causes the new mRNA strand to become double stranded by producing a complementary strand known as the tRNA strand, which when combined are unable to form structures from base-pairing. Moreover, the template for mRNA is the complementary strand of tRNA, which is identical in sequence to the anticodon sequence that the DNA binds to. The short-lived, unprocessed or partially processed product is termed ''precursor mRNA'', or ''[[pre-mRNA]]''; once completely processed, it is termed ''[[mature mRNA]]''.{{cn|date=February 2024}}