The main reason some RNA is cut and spliced is to remove duplicate or inactive sections after the mRNA (messenger RNA) is transcribed from DNA. DNA contains the instructions for making proteins. When it is transcribed by mRNA, the mRNA contains areas that are not needed in order to make the resulting proteins. These unnecessary segments are called introns. They are removed, leaving the entrons, which are the segments that are then read and translated...
The main reason some RNA is cut and spliced is to remove duplicate or inactive sections after the mRNA (messenger RNA) is transcribed from DNA. DNA contains the instructions for making proteins. When it is transcribed by mRNA, the mRNA contains areas that are not needed in order to make the resulting proteins. These unnecessary segments are called introns. They are removed, leaving the entrons, which are the segments that are then read and translated into the protein. The mechanism by which the cutting and splicing occurs is through a spliceosome. The first link below contains an animation of this process.
The second reason mRNA is cut and spliced is that it makes it possible for one segment of DNA to code for several different proteins, depending on what is kept as part of the mRNA, and what is eliminated.
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