alleryIn eukaryotes, exons are:
AThe expressed (coding) sequences retained in mature mRNA
BThe intervening (non-coding) sequences removed during splicing
CIdentical to introns
DThe 5′ caps
Answer & Solution
Correct answer: A. The expressed (coding) sequences retained in mature mRNA
**Exons** = **ex**pressed sequences, retained in mature mRNA.
**Introns** = intervening, removed by splicing.
The split-gene arrangement is characteristic of eukaryotic monocistronic genes (most prokaryotic genes have no introns).
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