The sigma subunit of prokaryotic RNA polymerase_______________?
Correct answer: B. Specifically recognizes the promoter site
- A. Binds the antibiotic Rifampicin
- B. Specifically recognizes the promoter site
- C. Is inhibited by a-amanitin
- D. Is part of the core enzyme
Explanation
The sigma subunit gives bacterial RNA polymerase promoter specificity by recognizing promoter regions such as the -10 and -35 sequences. Rifampicin targets the beta subunit, and alpha-amanitin inhibits eukaryotic RNA polymerase II rather than sigma.
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