No. Those are two different parts of pre-mRNA before the transcription is finished. The intron is the non coded region, and is therefore spliced out of the mRNA.
The coding portions of eukaryotic genes are split in to two types of DNA, introns and exons. Only the exons code for the protein itself. The introns often contain control regions and are 'spliced out' in a process known as post-transcriptional modification.
It's actually a little more complicated than that in practice, as some genes have exons which they sometimes include in the mRNA that goes for transcription and at other times they won't include those exons, they'll splice them out in the same way as they would an intron. An example of this would be the cartilage structural protein collagen II.
They are extremely well defined boundaries.
No
No, a gene includes regulatory regions, sometimes introns, as well as protein encoding regions, but only the sequence of DNA that codes for amino acids is translated. see http://www.answers.com/intron?cat=health&gwp=13
intron
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.
They are extremely well defined boundaries.
yes
on a gene it can occur on the promoter, intron-exon borders, poly-A-tail cleavage sites and on the exon
The answer is "DNA". It depends on the parts of the DNA that are activated and what part of the RNA-model is an intron or an exon. Only the exons get copied as RNA goes to the ribosomes, where proteins are made.
No
As you might know, introns DNA is something you can called 'Junk Fragments'. It didn't contain any information. So its function as a protection to the coding fragment (exon...maybe i misspell it ). DNA is subjected to many kind of mutation caused by chemical compounds or physical cause (gamma rays, for example). With Intron, when there's a mutation, there's a high probability that the one which subjected to the mutation is intron not exon. This way, eukaryote cells might survive from genetic mutation. Human has a large number of intron in one gene. It cause human to survive from many kind of mutation.
These are known as introns. There are more than one type. You can always tell an intron from an exon by the fact that exons are the [reassembled] genes that are, after the introns are excised, expressed.
Exon DNA encodes for the RNA included in the final mRNA transcript that encodes for proteins. Intron DNA is found within exons, but is spliced out as the mRNA molecule is processed.
Exons code for amino acids (they are usable codons) Introns code for nothing.
The definition of the 'intron' is part of the DNA sequence within a gene. It is the sequence within a particular gene that is removed during the RNA splicing process.
Jim Exon's birth name is John James Exon.
An exon is the section of a gene that codes for a protein or part of a protein, different exons can be spliced together to form different genes in eukaryotes