Genes that make mRNA have exon regions for translation and intron regions not for translation.
introns
RNAs typically have several introns. Introns came from bacteria or, if protein folding requires them, have always been in genes. After transcription, mechanisms {RNA splicing}| splice introns out.
exons
Exons typically are functional domains, and proteins have different functional domains. Exons can mix in different ways to make membrane-bound or secretable proteins or to make proteins for different development stages or different tissues.
process
After mRNA leaves cell nucleus, cell processes splice out introns and join exons {mRNA splicing}, to make mRNA for translation. Introns have 5' sequences and 3' sequences.
Biological Sciences>Genetics>Post-Transcription>Splicing
4-Genetics-Post-Transcription-Splicing
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Date Modified: 2022.0224