AP BIOLOGY

Detailed explanation-1: -These pre-mRNA molecules go through a modification process in the nucleus called splicing during which the noncoding introns are cut out and only the coding exons remain.

Detailed explanation-2: -An intron is a region that resides within a gene but does not remain in the final mature mRNA molecule following transcription of that gene and does not code for amino acids that make up the protein encoded by that gene.

Detailed explanation-3: -RNA splicing removes the introns from pre mRNA to produce the final set of instructions for the protein.

Detailed explanation-4: -In RNA splicing, specific parts of the pre-mRNA, called introns are recognized and removed by a protein-and-RNA complex called the spliceosome. Introns can be viewed as “junk” sequences that must be cut out so the “good parts version” of the RNA molecule can be assembled.

Detailed explanation-5: -Introns are removed from primary transcripts by cleavage at conserved sequences called splice sites. These sites are found at the 5′ and 3′ ends of introns. Most commonly, the RNA sequence that is removed begins with the dinucleotide GU at its 5′ end, and ends with AG at its 3′ end.