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Which of the following steps happens first during transcription?

Which of the following steps occurs first during the process of transcription? a. RNA polymerase reaches the end of the gene. b. RNA polymerase reaches the beginning of the gene. c. RNA polymerase unwinds the double helix. d. RNA polymerase synthesizes mRNA from DNA.

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3 Answers

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Sonny Greenholt

Feb 20, 2025

The first step in gene expression would be the transcription of RNA. What happens here is that a part of the DNA is being replicated into the RNA through an enzyme. Therefore, what happens first during transcription is that, the RNA polymerase reaches the start of a gene. The answer would be B.
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Anonymous

Feb 20, 2025

The correct answer is - B. RNA polymerase reaches the beginning of a gene. Explanation:Transcription is a phenomenon of synthesis of mRNA (messenger RNA) using a template DNA, which takes place with the help of enzyme RNA polymerase. This enzyme reaches the site from where the gene begins and thus follows its transcription using a DNA template. It adds nucleotides in the direction 5' to 3' that is complementary to the DNA template.Therefore, to begin the process, enzyme RNA polymerase reaches the start site of gene. Thus, option B) is the right answer.
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A
Anonymous

Feb 20, 2025

B. RNA polymerase reaches the beginning of a gene
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