With regard to mature mRNA in eukaryotes

exons and introns do not appear in the mature RNA

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exons appear but introns do not appear in the mature RNA

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introns appear but exons do not appear in the mature RNA

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both exons and introns appear in the mature RNA.

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Solution

The correct option is B exons appear but introns do not appear in the mature RNA
Eukaryotic transcripts possess extra segments called introns or intervening sequences or noncoding sequences. They do not appear in mature or processed RNA. The functional coding sequences are called exons. Splicing is removal of introns and fusion of exons to form functional RNAs.

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