Multiple Choice
During which stage of transcription do the following processes take place?
1. RNA polymerase binds to the promoter.
2. The RNA transcript is released.
3. The RNA transcript extended.
3. Energy & Cell Processes
Steps of Transcription
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What happens during the initiation step of DNA transcription?
A
The mRNA detaches from the RNA polymerase as the RNA polymerase leaves the DNA strand.
B
RNA polymerase attaches to the DNA at the promoter sequence of the gene.
C
A ribosome attaches to the initiation codon of a completed mRNA strand.
D
RNA polymerase moves along the template strand of the DNA creating an mRNA strand.
Verified step by step guidance1
Understand that DNA transcription is the process of copying a segment of DNA into RNA, specifically mRNA, which will later be used in protein synthesis.
Identify the role of RNA polymerase, which is the enzyme responsible for reading the DNA template and synthesizing the mRNA strand.
Recognize that the initiation step of transcription begins when RNA polymerase binds to a specific region of the DNA called the promoter. The promoter is a sequence of DNA that signals the start of a gene.
Note that the binding of RNA polymerase to the promoter sequence is crucial as it positions the enzyme correctly to start transcribing the DNA into mRNA.
Remember that once RNA polymerase is bound to the promoter, it unwinds the DNA strands and begins synthesizing the mRNA by adding complementary RNA nucleotides to the growing mRNA strand.
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