Transcription as the production of mRNA from DNA; the role of RNA polymerase
Transcription is the process where a cell copies a gene from DNA into a single-stranded molecule called mRNA. The enzyme RNA polymerase carries out this copying.
Real World
RNA polymerase was identified and isolated in E. coli bacteria in the 1960s; today, drugs like rifampicin used to treat tuberculosis work specifically by blocking bacterial RNA polymerase, confirming its essential role in transcription.
Exam Focus
State that RNA polymerase unwinds DNA and moves along the template strand 3'→5', building the mRNA strand 5'→3'; direction errors lose marks.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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