Answer:
The correct answer is - option D. product of transcription, called the primary transcript, is cut and put back together to produce the mature mRNA transcript.
Step-by-step explanation:
RNA splicing is the process in which primary transcript is produced in the process of the transcription, is cut the introns, and joins the exon to form the mature mRNA transcript. This mRNA transcript is used later in the translation to produce peptide chain in the protein synthesis in the eukaryotic cells.
RNA splicing is done with the help of a spliceosome that cuts introns and puts back exons in the mRNA. These spliceosomes are made up of specific proteins and RNA molecules.