Can you please explain to me what introns and exons are and why they get cut out?
A. When an mRNA molecule is transcribed from the DNA that makes up a gene, not all of the base sequence in this preliminary mRNA is used for translation, so some bits get cut out (called introns). The remaining bits (called exons) make up the mature mRNA and it is this bit that goes to a ribosome to be translated into a chain of amino acids. Why? Well, this is a long story really and you do not need to really understand this. But one thing that can happen is that the same gene can result in different polypeptides because the mRNA can be “spliced” in different ways to produce different mature mRNAs. VM Q. Somehow, I decided to venture over to the wikispace 2008 page, and had a look at the SAC criterion for their evolution SAC. Can I assume (never assume) that that information is a good starting point to begin revising for the upcoming SAC even if those dotpoints will not necessarily be used on OUR SAC? (That was far more complicated than it needed to be. Trust that i would go the round-
