Difference between Introns and Exons
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Introns |
Exons |
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Found only in Eukaryotes (Few exceptions are present in prokaryotes e.g. one of the genes found in Bacillus bacteriophage) |
Found in both the prokaryotes and eukaryotes |
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Non-coding nucleotide sequences (do not code for any amino acid) |
Codes for the amino acid sequences during the process od transcription |
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Removed during the post-transcription modifications of hnRNA in order to form a mature mRNA. |
Joined together to form mRNA during the post-transcription modifications of hnRNA in order to form a mature mRNA. |
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A frequent mutation can be seen in introns; hence are considered less conserved regions |
a few mutations are listed in these regions and are considered the most conserved regions. |
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A few mature mRNAs contain some intron sequences, hence imparting complexity to the genome. |
Some of the exons may be excluded during the process of post-transcriptional events and hence imparting genome complexity. |
Note: Introns can also code an amino sequence if they are present in mature mRNA. For example, during experimental cases when we clone a eukaryotic gene in a prokaryotic system at that time it can be seen that the introns can also code for the amino acids. It the post-transcriptional modifications which exclude the intron sequence from a mature mRNA and make them non-coding sequences.
Difference Between Introns and Exons
Difference Between Introns and Exons: Introns and Exons are the integrated part of the eukaryotic genome. Introns are intervening non-coding nucleotide sequences whereas the exons are the amino acid coding sequences.
We have seen various evolutionary changes from the prokaryotes to the eukaryotes. The eukaryotic cells have become more advanced and organised as compared to prokaryotes. Although prokaryotes have a higher tendency to evolve faster than eukaryotes, but the level of complexity in a eukaryotic cell is unmatchable.
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