what is the role of Exons and introns in splicing mechanism?
957934
The introns are the bits which are spliced out of the pre-mRNA to form the mature mRNA, the exons are the bits which code for polypeptides to make the final protein - so these are the bits which are left IN, and translated by the ribosomes. \n\nSo spliceosomes splice out introns, and join the exons together.
198401
ummm... let's see.... the transcription of RNA means that it is it's encoding, or if you want to call it, program. It is the set of chemical codes used for producing DNA. Translation, on the other hand, I am not still not quite sure of. I believe that it might be the refined form of RNA, like trying to create a vaccine for somthing. I hope this helps!
935437
Yes, through genetic splicing as long as an intron is inserted as well.
909471
1) DNA\n\n2) Chromosomes\n\n3) Genes
273088
The process is called as Translation \n\nTranslation takes place on the ribosome which are attached to the mRNA (messenger RNS). \n\nIt is essential for the production of proteins which are the main building blocks of the body and also for the production of enzymes (also proteins) for various metabolic activithes .It is also required for the synthesis of all cell organells.
317802
DNA and RNA\n\nFor example:\nBacteriophages contain DNA\nRetroviruses use RNA instead
913194
Transcription (genetics), the process of copying DNA to RNA by an enzyme called RNA polymerase (RNAP) \nTranscription is the process through which a DNA sequence is enzymatically copied by an RNA polymerase to produce a complementary RNA. Or, in other words, the transfer of genetic information from DNA into RNA. In the case of protein-encoding DNA, transcription is the beginning of the process that ultimately leads to the translation of the genetic code (via the mRNA intermediate) into a functional peptide or protein. Transcription has some proofreading mechanisms, but they are fewer and less effective than the controls for DNA; therefore, transcription has a lower copying fidelity than DNA replication.\n\nLike DNA replication, transcription proceeds in the 5' → 3' direction (ie the old polymer is read in the 3' → 5' direction and the new, complementary fragments are generated in the 5' → 3' direction). Transcription is divided into 3 stages: initiation, elongation and termination.\n\nclick here:http://en.wikipedia.org/wiki/Transcription_%28genetics%29#Prokaryotic_transcription
207487
No.  Transcription makes mRNA.  DNA is made by the process of replication.
479736
This is more of an issue in eukaryotes where there is a lag time between DNA transcriptino and mRNA translation.  One reason that mRNA doesn't hang around in the cell is that it serves no purpose for the cell...mRNA is pretty much useless until it is translated.  Also, mRNA that is about to be translated is modified with a 5' cap and a 3' poly-A tail.  If the mRNA doesn't get to the ribosome (and therefore doesn't undergo these modifications) it is highly susceptible to 5'-3' exonucleases and some endonucleases (depending on the organism).
845407
RNA polymerase is necessary for making RNA from DNA and is found in pretty much all organs, cells, and viruses.\n\ndoes this help?
986451
as someone already mentioned, there is one process called alternative splicing. a single gene, a single DNA sequence, can be transformed into several proteins. RNAm is formed in the process of transcription, but it cannot leave the cell nucleus without being processed by several enzymes, which remove certain bits of RNA (introns) and leave others (exons). These exons that remain are to exit the nucleus and be translated into proteins.\nThe thing is, these enzymes that "process" DNA can do it in several different ways. For the same sequence, there can be an enzyme that recognises certain bits of DNA as introns and another enzyme that recognises different bits of the SAME sequence as introns. Thus being, the two molecules of processed DNA to exit the nucleus will be different and, consequently, yield different proteins.\nthis multiplicity of codification is an evolutionary advantadge of eukarya, since it allows a lot more information to be contained in the same sequence of DNA, thus occupying less space within the cell; this might have been one of the key events that allowed the development of more complex cells, from prokaryotes to eukaryotes.\n\njust to complement the given information: these several proteins that can be coded in the same gene, usually belong to the same protein family or else have a similar function, e.g. in the same process)
773389
RNA starts at promoter\n\nDNA needs primer to start
386933
With a transposable element, i believe it is easier to control where the genes get spliced in.  using a plasmid to infect the gene would likely be random
472444
Listen carefully and ignor anyone who tells you diffrently. All the informaton needed for every protien in the body is stored as DNA. When a particular protien is needed, the streatch of DNA that codes for it is copied into RNA. THis piece of RNA is called a transcript. \n\nThe transcript is usually proccessed in the cell before being sent to the ribosom. There the ribosom reads the nucleic acids in groups of three. So no one nucleic acid makes a protien, but three nucleic acids determine one amino acid. A string of amino acids makes up a protien.
510482
A, B, and Z DNA are the 3 main types which refer to the orientation of the structure of the double-helix, and therefore, the ability of the DNA to express (turn on) genes.\n\nOther designations are gDNA (genomic DNA), also called wtDNA (wild-type DNA) which is DNA as it is found normally in nature.  cDNA is DNA which contains only the exon portions of genes and omite the intron portions.  Introns are the portions of genes which are spliced out once the gene is actually expressed.  The role of introns in genes is not functional and is speculated structural.\n\nIn molecular biology, we use many such working designations to determine the type of DNA we are using.  These help us to define the structure and nature of the form of a gene we are using for research purposes.
944345
mRNA is essentially the "working copy" that gets actually used to guide protein synthesis.  It's like keeping a master schedule on your computer.  You wouldn't have everyone consult your computer to see the schedule, you'd print them a copy, and keep the schedule safe on your computer.\n\nThe other purpose of mRNA is to control protein expression.  You've got your one set of DNA, with (for most genes) one copy of every gene your body needs.  But any given cell wants to express only certain proteins, and how much of a certain protein is wanted depends on the cell type, and wha't going on in the life of the cell.\n\nSo if a cell wants lots of a gene product, it makes lots of mRNA.  And if it doesn't want to express a gene at all, it makes none.
1182355
Remember this: \n\nRNA (A, U, G, C)\nDNA (T, A, C, G)\n\nDNA has sequence: T-C-A-T-C-G \nmRNA would be c) : A-G-U-A-G-C