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Introns are removed by RNA splicing as RNA matures, meaning that they are not expressed in the final messenger RNA (mRNA) product, while exons go on to be covalently bonded to one another in...
The term ‘intron’ represents the intragenic region which is present within a gene. The term ‘introns’ indicates both the DNA sequences within the gene and the corresponding sequence in RNA transcripts.
Introns and exons are part of the cell's DNA genetic code, but exons encode proteins while introns are non-coding sequences. During DNA transcription, introns and exons are copied to a preliminary form of messenger RNA. The introns are then discarded while the exons are used to synthesize proteins.
The sections of DNA (or RNA) that code for proteins are called exons. Following transcription, new, immature strands of messenger RNA, called pre-mRNA, may contain both introns and exons.
Difference Between Exons and Introns. Exons are termed nucleic acid coding sequences, which are present in mRNA. Introns are the non-coding sequences present in the hnRNA, which are removed by RNA splicing before translation.
Introns tend to occur between those portions of genes that encode structural domains of proteins. Duplication of the exons encoding structural domains and subsequent recombination can lead to more rapid evolution of a new protein, essentially using the parts from earlier evolved genes.
The non-intron sequences that become joined by this RNA processing to form the mature RNA are called exons. [3] Introns are found in the genes of most eukaryotes and many eukaryotic viruses and they can be located in both protein-coding genes and genes that function as RNA (noncoding genes).