Describe how mRNA is formed by transcription in eukaryotes.
- AQA - A-Level Biology - Question 10 - 2020 - Paper 1
Question 10
Describe how mRNA is formed by transcription in eukaryotes.
Worked Solution & Example Answer:Describe how mRNA is formed by transcription in eukaryotes.
- AQA - A-Level Biology - Question 10 - 2020 - Paper 1
Hydrogen bonds break
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Hydrogen bonds between the DNA base pairs break, leading to the separation of the DNA strands.
One DNA strand acts as a template
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Only one of the DNA strands serves as a template for the synthesis of mRNA.
Free RNA nucleotides align
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Free RNA nucleotides align with the template strand through complementary base pairing.
Uracil replaces thymine
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In RNA, uracil is used instead of thymine, pairing with adenine on the DNA template.
RNA polymerase joins nucleotides
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RNA polymerase facilitates the joining of these aligned nucleotides to form the growing mRNA strand.
Pre-mRNA is spliced
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The pre-mRNA undergoes splicing to remove introns, resulting in a mature mRNA molecule.
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