Steps of Transcription

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Steps of Transcription

Learning Objectives Describe the steps of DNA transcription

Central Dogma DNA Transcription RNA Translation Protein (Nucleus) (Cytoplasm) DNA Transcription RNA Translation Protein

RNA Polymerase RNA polymerase – an enzyme that makes a strand of messenger RNA.

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Step 1: Initiation DNA unwinding and unzipping along base pairs RNA polymerase finds the DNA and unwinds/unzips the DNA strands.

Step 2: Elongation mRNA forming Free bases RNA polymerase uses one strand of DNA as a template to assemble free nucleotides into mRNA. C G A U

Step 3: Termination Newly synthesized mRNA strand is released from DNA template. The mRNA leaves the nucleus and enters the cytoplasm. DNA re-zips and re-twists.

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