AP BIOLOGY

Detailed explanation-1: -Following transcription, new, immature strands of messenger RNA, called pre-mRNA, may contain both introns and exons. The pre-mRNA molecule thus goes 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: -Introns leave the nucleus while exons are spliced and remain in the nucleus.

Detailed explanation-3: -When genes are transcribed, those exons and introns are included in the initial messenger RNA products. However, introns are removed during the process called splicing so only exons are included in the mature mRNA and used to dictate what proteins are produced.

Detailed explanation-4: -During the process of splicing, introns are removed from the pre-mRNA by the spliceosome and exons are spliced back together. If the introns are not removed, the RNA would be translated into a nonfunctional protein. Splicing occurs in the nucleus before the RNA migrates to the cytoplasm.

Detailed explanation-5: -Answer and Explanation: mRNA that includes introns is processed. mRNA processing occurs in the nucleus. It involves the removal of introns through a process called mRNA splicing.