Transcription of RNA from DNA has alot of amazing steps that amazed me.One of them is that during the proccessing of m-RNA primary transcript,the introns are edited out.My question is if these codons are edited out in this step(they will not be translated) so what is the purpose of having them at all?
Another amazing things :why there is one codon for start and there are three codons for stop?What do you think the resons?And what will happen if there are the same number of codons for both the start and the stop?
or if the opposite happen( 1 codon for stop and 3 for start)????
2007-02-13 03:45:50 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Both of these phenomena give you some versatility.
If you can splice out parts of your message it gives you the potential to make several types of mRNA (and several types of proteins) from the same gene. Think of it like adding on various components to a computer. Alternative splicing allows humans with 25,000 genes to express 70,000 different proteins, and is a critical part of the immune system.
The stop codons have different "strengths", in that there are strong stop codons that stop translation every single time, and there are weak stop codons that sometimes allow the ribosome to slip by and keep making protein. Again, this allows you to make different kinds of proteins from the same gene, but also to make sure that if the protein absolutely has to be right you can make it 100% correct. This is used more in prokaryotic and viral organisms.
2007-02-13 03:57:48 · answer #1 · answered by floundering penguins 5 · 1⤊ 0⤋