AP BIOLOGY

Detailed explanation-1: -One of the steps in this processing, called RNA splicing, involves the removal or “splicing out” of certain sequences referred to as intervening sequences, or introns.

Detailed explanation-2: -The process of removing the introns and rejoining the coding sections or exons, of the mRNA, is called splicing. Once the mRNA has been capped, spliced and had a polyA tail added, it is sent from the nucleus into the cytoplasm for translation.

Detailed explanation-3: -RNA splicing removes the introns from pre mRNA to produce the final set of instructions for the protein. As DNA is transcribed into RNA it needs to be edited to remove non-coding regions, or introns, shown in green.

Detailed explanation-4: -In splicing, some sections of the RNA transcript (introns) are removed, and the remaining sections (exons) are stuck back together. Some genes can be alternatively spliced, leading to the production of different mature mRNA molecules from the same initial transcript.

Detailed explanation-5: -For many eukaryotic introns, splicing occurs in a series of reactions which are catalyzed by the spliceosome, a complex of small nuclear ribonucleoproteins (snRNPs). There exist self-splicing introns, that is, ribozymes that can catalyze their own excision from their parent RNA molecule.