AP BIOLOGY

Detailed explanation-1: -RNA splicing is a process in molecular biology where a newly-made precursor messenger RNA (pre-mRNA) transcript is transformed into a mature messenger RNA (mRNA). It works by removing all the introns (non-coding regions of RNA) and splicing back together exons (coding regions).

Detailed explanation-2: -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. Sources: image by Robert Yates.

Detailed explanation-3: -Answer and Explanation: The pre-mRNA contains introns and exons. Introns are the non-coding regions that are removed from the mature mRNA. Exons are the protein-coding regions that are spliced together by the spliceosome after removal of the intron.

Detailed explanation-4: -The pre-mRNA sequence is composed of regions called exons and introns in an interleaved manner. Only exons are used for protein coding so, on the splicing stage, introns are removed from the sequence and the exons are merged into a new chain, the mature mRNA.

Detailed explanation-5: -In some genes, not all of the DNA sequence is used to make protein. Introns are noncoding sections of an RNA transcript, or the DNA encoding it, that are spliced out before the RNA molecule is translated into a protein.