Multiple Choice
During transcription, what event occurs during the elongation phase?
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15. Gene Expression
Introduction to Transcription
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During which stage of bacterial transcription is the σ (sigma) subunit of the RNA polymerase involved?
A
Elongation
B
Termination
C
Initiation
D
Splicing
Verified step by step guidance1
Understand the role of the σ (sigma) subunit in bacterial transcription. The σ subunit is a component of RNA polymerase that is crucial for the initiation of transcription.
Recognize that transcription in bacteria involves three main stages: initiation, elongation, and termination.
During the initiation stage, the σ subunit helps the RNA polymerase to recognize and bind to specific promoter regions on the DNA, which are sequences that signal the start of a gene.
Once the RNA polymerase is correctly positioned at the promoter, the σ subunit facilitates the unwinding of the DNA double helix, allowing the polymerase to begin synthesizing RNA.
After the initiation phase, the σ subunit typically dissociates from the RNA polymerase, allowing the core enzyme to continue with the elongation of the RNA transcript.
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