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Question
Biology
Posted 6 months ago
Explain why the mRNA sequence is so much shorter than the DNA sequence
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Answer from Sia
Posted 6 months ago
Answer
The mRNA sequence is shorter than the DNA sequence because it represents only a portion of the DNA that codes for a specific protein.
Solution
a
Transcription : During transcription, only the genes that are being expressed are transcribed into mRNA
b
Introns and Exons : Eukaryotic genes contain non-coding sequences called introns that are removed during RNA processing to form mRNA
c
mRNA Processing : The mRNA undergoes splicing where introns are removed and exons are joined to form a mature mRNA strand that is much shorter than the initial transcript and the DNA sequence
Key Concept
mRNA is a processed transcript of a gene
Explanation
mRNA is shorter because it is a processed copy of only the exons from a gene that are necessary for protein synthesis, excluding introns and non-coding regions present in the DNA.

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