Why Are Some mRNA Transcripts Bigger Than Others?

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Homework Statement


After isolating the same mRNA transcripts of the same gene, why are some transcripts bigger than others?

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The Attempt at a Solution

 
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Yes, the poly(A) tails can be of differing length (e.g. some poly(A) tails may have undergone more degradation than others). The mRNAs can also be alternatively spliced resulting in differently sized transcripts.
 

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