Sigma protein subunits in bacteria are responsible for:

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BlackTom AI · Accepted Answer

The question asks about the role of sigma protein subunits in bacteria.
In bacterial transcription, the RNA polymerase core enzyme cannot efficiently locate promoters on its own. The sigma factor binds to the core enzyme to form the RNA polymerase holoenzyme, which enables promoter recognition and the initiation of transcription. This pairing is essential for starting transcription at the correct genomic location.
Because the provided answer indicates that sigma subunits are responsible for the initiation of transcription, that aligns with the established role of sigma factors in promoter specificity and transcription initiation.
If we consider typical alternative possibilities (which are not provided here but help illustrate the concept): elongation would involve the RNA polymerase synthesizing RNA after initiation, which is not the primary role of sigma factors; termination would involve releasing the RNA transcript and dissociating the complex, which sigma factors do not primarily mediate; replication or other processes would be unrelated to sigma factors and transcription initiation. These plausible misinterpretations help reinforce why sigma factors are specifically tied to the initiation step.
Given the standard biological understanding, the sigma subunits’ core function is to enable transcription initiation by guiding RNA polymerase to promoter sequences, forming a holoenzyme capable of accurate transcription start.

BIOT5750.39480.202530 Module 7 Quiz S25

Sigma protein subunits in bacteria are responsible for:

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BIOT5750.39480.202530 Module 7 Quiz S25

Sigma protein subunits in bacteria are responsible for:

查看解析

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类似问题

Question at position 19 In eukaryotes, RNA polymerase binds to a _____________ called the ____________ region.protein: transcriptsequence of DNA;transcriptNone of the above, eukaryotes do not use RNA polymerasesequence of DNA; promoterprotein; promoterClear my selection

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In the process of eukaryotic gene expression, the formation of the Transcription Initiation Complex is a critical regulatory step. Which of the following components is correctly matched with its role in this complex at the promoter?

In eukaryotes, where do general transcription initiation factors bind?

What is the function of the Pribnow box?

更多留学生实用工具

希望你的学习变得更简单

Question at position 19 In eukaryotes, RNA polymerase binds to a _ called the region.protein: transcriptsequence of DNA;transcriptNone of the above, eukaryotes do not use RNA polymerasesequence of DNA; promoterprotein; promoterClear my selection