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In bacterial transcription the sigma factor associates with RNA polymerase to:
A{'text': 'Terminate transcription at the rho site', 'label': 'A'}
B{'text': 'Catalyse elongation of the RNA chain', 'label': 'B'}
C{'text': 'Recognise the promoter and initiate', 'label': 'C'}
D{'text': 'Splice introns out of the transcript', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Recognise the promoter and initiate', 'label': 'C'}
In bacteria a single RNA polymerase transcribes all RNAs. Sigma associates with it to recognise promoters and start transcription; rho is the termination factor. The core polymerase alone catalyses elongation.
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