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Many biologist believe that having the genes of eukaryotic cells interrupted by introns?
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∙ 11y ago
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∙ 11y ago
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Why do eukaryotic genes have introns but introns are absent from prokaryotic cells?
Look at the sheer amount of DNA that is contained into a eukaryotic gene (eukaryotes have more DNA to code for and so they can leave some of the DNA out, also look at the way the DNA is formed i.e. Eukaryotic genes are double stranded helixes and prokayrotic genes are a single strand of circular dna.
Why would a prokaryote fail to express a transplanted eukaryotic gene?
The biggest obstacle to expressing eukaryotic genes in prokaryotes is their structure. Eukaryotic genes have non-coding introns inserted between the coding exons, and these introns must be spliced out of the primary mRNA transcript before translation can proceed. The splicing is done by the spliceosome, a large, complex of RNA and protein. Prokaryotes do not have spliceosomes, thus eukaryotic genes would be transcribed with the introns intact, and translation by the ribosome would proceed on the primary mRNA transcript, resulting in non-functional proteins.
Why do scientists think that introns and exons contribute to evolutionary flexibility?
many biologist think that this organization of genes add evolutionary felixablity . Each Econ protein adds a different part of a protein by having introns and Exons fellas can occasionally shuffle exons between genes and make new ones .
Do introns and exons play any role in protein synthesis?
Exons are part of both prokaryotic and eukaryotic. Introns are rarely present in the domain bacteria (common bacteria) while introns are present in some genes in domain archaea ("ancient" bacteria). Both are considered prokaryotic. No, they are only present on tRNA and rRNA.
Why are introns copied and then removed from the RNA sequence?
Introns were copied and then removed from the RNA sequence because they were placeholders.
Name the sections of eukaryotic genes that are transcribed and translated?
introns and exons
Sections of RNA molecules that are removed before eukaryotic gene becomes functional?
introns
The principal problem with inserting an unmodified mammalian gene into the bacterial chromosome and then getting that gene expressed is that?
bacteria cannot remove eukaryotic introns; bacterial dna does not contain introns like eukaryotic genes do so they had to be removed before being added to the plasmid.
What are the regions of DNA called that code for protein?
The coding regions of many eukaryotic genes are interrupted by non-coding sequences known as INTRONS. They are stretches of DNA whose transcripts are absent from mature mRNA product.
Why do eukaryotic genes have introns but introns are absent from prokaryotic cells?
Look at the sheer amount of DNA that is contained into a eukaryotic gene (eukaryotes have more DNA to code for and so they can leave some of the DNA out, also look at the way the DNA is formed i.e. Eukaryotic genes are double stranded helixes and prokayrotic genes are a single strand of circular dna.
What might be the evolutionary advantage of genes being interrupted by introns?
An intron is an area in the DNA that has not been translated into a protein. One evolutionary advantage of genes being interrupted by introns is that it reduces the occurrence of genetic mutations.
In eukaryotes only exons are translated?
Correct. The mRNA transcibed from the DNA in the nucleus has both exons and introns; the introns are taken out and the exons are left in. The mended exons exit the nucleus and the introns stay in the nucleus. Only the exons are translated at the ribosomes. (In Eukaryotic cells only)
What is the primary transcript of eukaryotic genes?
the primary transcript usually has a exons and introns which need to undergo splicing to remove the introns and re-splicing to join the exons ..after this process the resulting mRNA is a mature mRNA.
Why would a prokaryote fail to express a transplanted eukaryotic gene?
The biggest obstacle to expressing eukaryotic genes in prokaryotes is their structure. Eukaryotic genes have non-coding introns inserted between the coding exons, and these introns must be spliced out of the primary mRNA transcript before translation can proceed. The splicing is done by the spliceosome, a large, complex of RNA and protein. Prokaryotes do not have spliceosomes, thus eukaryotic genes would be transcribed with the introns intact, and translation by the ribosome would proceed on the primary mRNA transcript, resulting in non-functional proteins.
The sections of an mRNA molecule that are removed before translation are?
Sections of RNA molecules that are removed before a eukaryotic gene becomes functional introns. The signal in DNA that indicates to enzymes where to bind to make RNA is the promoter.
The difference between prokaryotic and eukaryotic DNA?
The difference is that eukaryotic DNA is organized into a well defined nucleus and prokaryotic DNA is not. An example of a prokaryote is bacteria (or a bacterium). Humans and fungi are eukaryotes. Prokaryotes also do not have introns (DNA that is not expressed), while Eukaryotes do.
Why do scientists think that introns and exons contribute to evolutionary flexibility?
many biologist think that this organization of genes add evolutionary felixablity . Each Econ protein adds a different part of a protein by having introns and Exons fellas can occasionally shuffle exons between genes and make new ones .
