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GCSE Biology · key term
An enzyme that binds to DNA and joins RNA nucleotides together to produce an mRNA strand.
Used by Edexcel
Specification 3.8B, 3.9B · Paper 1
Revise: Transcription: Non-coding DNA and mRNA SynthesisThe enzyme RNA polymerase binds to this region, positioning it at the beginning of the gene.
An enzyme that binds to DNA and builds a complementary mRNA copy during transcription.
For a complete description, state that the DNA unwinds, name RNA polymerase, identify its binding to the non-coding DNA in front of the gene, and explain that RNA nucleotides are joined to form complementary mRNA.
Build explanations as a complete causal chain: non-coding DNA variant → altered RNA polymerase binding → altered transcription → a different quantity of mRNA → a different quantity of protein → possible change in phenotype.
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