St. Thomas, St. John, and St. Croix-the three islands known to many as the U.S. Virgin Islands, and the reason millions of travelers head to the Caribbean every year.
This copying process is called transcription and the copy is mRNA. Transcription takes place in the cytoplasm (prokaryote) or in the nucleus (eukaryote). The transcription is performed by an enzyme called RNA polymerase. To make mRNA, RNA polymerase: 1  Binds to the DNA strand at a specific sequence of the gene called a promoter. 2  Unwinds and unlinks the two strands of DNA. 3  Uses one of the DNA strands as a guide or template.
Once a DNA sequence has been transcribed as a hnRNA strand, the introns will be spliced out. The resulting mRNA sequence will then be translated into a protein. A spliceosome is a complex of specialized RNA and protein subunits that removes introns from a transcribed hnRNA (often called pre-mRNA) segment.This process is generally referred to as splicing.nce a DNA sequence has been transcribed as a hnRNA strand, the introns will be spliced out. The resulting mRNA sequence will then be translated into a protein. A spliceosome is a complex of specialized RNA and protein subunits that removes introns from a transcribed hnRNA (often called pre-mRNA) segment.