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What happens to the introns and exons during transcription?
Osvaldozapata319fb14...
After transcription, the mRNA is processed by the spliceosome, which splices out the introns (because introns are not part of the coding sequences for protein), and "stitches" the exons together to form the final transcript that is sent to the ribosome for translation.
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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)
Name the sections of eukaryotic genes that are transcribed and translated?
introns and exons
How do introns and exons relate to RNA splicing?
Before the RNA leaves the nucleus, the introns are removed and the exons are joined together, producing an mRNA molecule with a continuous coding sequence. This process is called RNA splicing.
What is the significance of introns and extrons?
a. Functionali. Intronsmay control gene activityii. Alternate splicing can give >1 protein from the same geneb. Evolutionaryi. Exons code for functional domains of proteinsii. Widely spaced functional components allows recombination č newproteins
What is the difference between an intron and exon?
Exons code for amino acids (they are usable codons) Introns code for nothing.
Spliced together during mrna processing?
Exons, after the introns have been cleaved.
What is the small pieces of DNA that are edited out of the mRNA message before it is expressed?
During the transcription, when the mRNA is being processed, the introns are removed and the exons are connected together.
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)
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.
Mutations in introns are less likely to affect phenotype then mutation in exons?
mutation in exons are less likely to affect phenotype then mutation in introns because mutaion in exons are silent mutation
What do you call a short piece of DNA that codes for a certain protein?
DNA does not make proteins directly. Rather, the DNA is the mother-of-all recipes that specialized transcription proteins (tRNA) read to make messenger RNA (mRNA). mRNA is the specific recipe to make specific proteins. The specific code of DNA are made of regions called introns and exons. Exons are what the gene has coded for and introns are "spacers". I remember exons are exactly what is needed and introns are intervening sequences.
What are the introns and exons?
An intron is a DNA region within a gene that is not translated into protein. After intron splicing (ie. removal), the mRNA consists only of exon derived sequences, which are translated into a protein.
Are introns non-expressed?
Yes they are. Exons are expressed.
What the remaining pieces called that are spliced together?
Introns, exons
What is the difference between exons and introns?
Exons are the DNA sequences that code for proteins. Introns are involved however they dont carry the genetic information that exons carry, the variation provides for revolutionary flexibility allowing cells to shuffle exons between genes to make new ones. A great way to remember which is which is Exons (sounds like Executives, like in a business) have the information and introns (sounds like the interns of a business) dont know anything; exons and inrons, executives and interns. Easy huh?
Name the sections of eukaryotic genes that are transcribed and translated?
introns and exons
What type of RNA holds information of both introns and exons?
mRNA
