Transcription and mRNA processing | Biomolecules | MCAT | Khan Academy
3:31
Polymerization Reaction in Transcription | RNA Synthesis
6:27
Transcription and Translation: From DNA to Protein
10:55
Transcription and Translation - Protein Synthesis From DNA - Biology
48:44
8. Transcription
Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA by the enzyme RNA polymerase.
Both DNA and RNA are nucleic acids, which use base pairs of nucleotides as a complementary language. During transcription, a DNA sequence is read by an RNA polymerase, which produces a complementary, antiparallel RNA strand called a primary transcript.