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. The final mRNA thus consists of the remaining sequences, called exons, which are connected to one another through the splicing process.

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: -The exons are pasted together by the spliceosome to make the final, mature mRNA that is shipped out of the nucleus.

Detailed explanation-4: -The coding region (also called coding sequence, or CDS), is the portion of the mRNA that is actually translated into protein. The mRNA also includes an untranslated region on each end, called the 5’ UTR and 3’ UTR. More: Exons can be spliced together in different combinations, in a process called alternative splicing.

Detailed explanation-5: -The stretches of DNA that do code for amino acids in the protein are called exons. During the process of splicing, introns are removed from the pre-mRNA by the spliceosome and exons are spliced back together.