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**Introns** in eukaryotic primary transcripts are:
ARemoved by splicing before mRNA is exported to cytoplasm
BRetained in the mature mRNA
CTranslated into a signal peptide
DFound only in tRNA
Answer & Solution
Correct answer: A. Removed by splicing before mRNA is exported to cytoplasm
hnRNA contains both **exons** (coding) and **introns** (non-coding). During processing, introns are spliced out and exons joined (by spliceosome / DNA ligase-like activity), capping and tailing follow, producing the mature mRNA — which is then exported and translated.
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