1. Under what conditions might Exons evolve more quickly than introns? 2. Give t
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Question
1. Under what conditions might Exons evolve more quickly than introns? 2. Give three eukaryotic mechanisms that produce more than one polypeptide from the same DNA sequence. 3. In comparing homologous genes in different species that retain similar functions, why are exons usually conserved but introns are more variable? 1. Under what conditions might Exons evolve more quickly than introns? 2. Give three eukaryotic mechanisms that produce more than one polypeptide from the same DNA sequence. 3. In comparing homologous genes in different species that retain similar functions, why are exons usually conserved but introns are more variable? 2. Give three eukaryotic mechanisms that produce more than one polypeptide from the same DNA sequence. 3. In comparing homologous genes in different species that retain similar functions, why are exons usually conserved but introns are more variable?Explanation / Answer
1. In the splicing of m RNA introns are removed and exons are ligated.
in auto splicing where no enzyme take parts in the splicing process where is licence occurs more quickly.
Autosplicing occurs in prokaryotic cells where no enzymes takes part in the splicing process and RNA itself acts as an enzyme and cleves the introns and ligares the exons.
Auto splicing also knowm as self splicing.
2. Proteins are synthesized from m RNA which is coded by the sequence of DNA.
By same DNA sequence more than 1 protein with different different Amino acid sequence can be coded by following methods which occurs naturally:
m RNA splicing: In this mRNA is splicing occurs in various manner so produce various kind of mature mRNA from one kind of pre mRNA.
Alternate splicing: Alternate splicing occurs in mRNA in which multiple introns are excluded from mRNA and exons are ligated in multiple possible combinations.
One another way to generate more than 1 possible combination of amino acid sequences or multiple protein formation by single DNA sequence is deletion and order changing in the exons. in this, any kind of exon can be deleted from the sequence of mRNA and the order of exons can be vary from each other which leads to diversity in protein.
3. Exons are ligated and then involved in the formation of mRNA which is further translated to form protein.
Introns are excluded out from immature mRNA and all exons are ligated to form mature mRNA. That is why exams are more conserved and introns sequences can be vary.
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