The enzyme RNA polymerase binds to DNA at the promoter region and unwinds the double helix.

One of the DNA strands is used as a template on which RNA nucleotides are assembled, forming a hybrid helix.

The same base pairing rules for DNA replication is used, except that Uracil (U) substitutes for Thymine (T) and pairs with Adenine (A).

The immediate product of transcription is a primary mRNA transcript.

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