Multiple Choice
Which step occurs when RNA polymerase attaches to the promoter DNA during transcription?
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15. Gene Expression
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 by which a segment of DNA is copied into RNA, specifically mRNA, by the enzyme RNA polymerase.
Identify the initiation step of transcription, which begins when RNA polymerase binds to a specific region of the DNA known as the promoter sequence.
Recognize that the promoter sequence is a region of DNA that signals the start of a gene and is crucial for the initiation of transcription.
Note that during initiation, RNA polymerase unwinds the DNA double helix to expose the template strand, allowing the enzyme to begin synthesizing mRNA.
Clarify that the initiation step does not involve the detachment of mRNA or the binding of ribosomes, as these occur in later stages of gene expression.
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