Which of the following problems can arise during posttranscriptional control?
A. Excising an exon from the pre-mRNA strand.
B. Incomplete excising of all introns from the pre-mRNA strand, leaving fragments to be joined with the exons.
C. Differential splicing of exons that can lead to an altered gene expression.
D. All of these are errors that can occur during posttranscriptional control of gene expression.
Answer: D
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