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Assertion: The sigma factor plays an important role in transcription initiation in prokaryotes.
Reason: The sigma factor recognizes the promoter region of DNA and facilitates the binding of RNA polymerase to initiate transcription.
Both assertion and reason are true, and the reason is the correct explanation of the assertion.
Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
The assertion is true, but the reason is false.
The assertion is false, but the reason is true.
Answers (1)
The assertion is correct. The sigma factor plays an important role in transcription initiation in prokaryotes. In prokaryotic cells, the sigma factor is a subunit of RNA polymerase that recognizes the promoter region of DNA and helps to initiate transcription.
The reason is also correct. The sigma factor recognizes the promoter region of DNA and facilitates the binding of RNA polymerase to initiate transcription. Specifically, the sigma factor recognizes specific DNA sequences known as promoter elements, which are located upstream of the transcription start site. These promoter elements are different in different genes and dictate the specificity of transcription initiation.
Option 1 is the correct answer.
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