Nurturing Life Sciences
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#Unit 2. Cellular Organization
Exons are the sequences which essentially encodes for functional and properly folded polypeptide or RNA molecule
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Introns are nucleotide sequence which cannot encode functional proteins or polypeptides or introns do not have a sequence-specific function.
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Introns have negative Fold Potential i.e. potential to form stem loop.
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Overlapping gene are the same sequence of DNA encodes two nonhomologous proteins because it uses more than one reading frame.
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Mutations occur at the same rate in both exons and introns, but exon mutations are eliminated more effectively by selection.
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Introns may more freely accumulate point substitutions and other changes due to no selection pressure.