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The process which eliminatesintrons is called 'splicing'. This process is mediated by the protein complex called a spliceosome and probably occurs simultaneously with RNA editing. RNA editing is the addition, removal or substitution of bases in an RNA molecule after it has been synthesised, and critically can occur in organisms which lack introns.

There are 3 main types of RNA editing:

1, Addition or removal of Uracil residues. Seen in the primary transcripts in trypanosome mitochondria (does not appear in multicellular organisms).

2, Cytosine -> Uracil Editing. Seen in mRNAs in some animals and plant mitochondria.

3, Adenosine -> Inosine. Seen in animal mRNAs. (Inosine is a very rare base which you get from the deamination of adenosine)

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Related Questions

What happens to the introns and exons during transcription?

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.


Are exons or introns removed during the process of splicing?

Exons are the parts of a gene that are kept and expressed, while introns are the parts that are removed during the process of splicing.


Are introns or exons removed during the process of mRNA splicing?

Exons are the parts of the mRNA that are kept and introns are the parts that are removed during the process of mRNA splicing.


Are exons or introns spliced out during the process of RNA splicing?

During the process of RNA splicing, introns are spliced out, while exons are joined together to form the mature mRNA molecule.


Spliced together during mrna processing?

Exons, after the introns have been cleaved.


What part is longer in an eukaryotic cell intron or exons?

In eukaryotic cells, introns are generally longer than exons. While exons are the coding regions that are expressed in proteins, introns are the non-coding segments that are spliced out during RNA processing. As a result, the total length of introns often exceeds that of exons, especially in complex genes with multiple introns.


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 happens to introns in eukaryotic mRNA during the process of splicing?

During the process of splicing in eukaryotic mRNA, introns are removed. This leaves only the exons, which are the coding regions, to be joined together to form the final mRNA molecule that will be translated into a protein.


How many introns are in CFTR?

The CFTR gene has 27 exons and 26 introns. Introns are non-coding sequences that are spliced out during mRNA processing, while exons are coding sequences that are retained in the final mRNA transcript.


What are the codes for proteins is it exons or introns?

The codes for proteins are found in the exons of a gene. Exons are the coding regions of a gene that are transcribed into mRNA and translated into proteins. Introns, on the other hand, are non-coding regions that are spliced out during RNA processing and do not contribute to protein synthesis.


What portion of an eukaryotic gene is not spliced out?

In a eukaryotic gene, the portion that is not spliced out is the exons. Exons are the coding sequences that remain in the mature mRNA after the introns, which are non-coding regions, have been removed during the splicing process. These exons are then translated into proteins, while the introns are discarded.


Are exons removed during the process of splicing in gene expression?

Yes, exons are not removed during the process of splicing in gene expression. Instead, introns are removed and exons are joined together to form the mature mRNA molecule.