What is the transcription unit?
transcription is a process that occurs in all living cells. During transcription, the sources of RNA are formed on the basis of DNA found in the cells. When the Messenger RNA (MRNA) spring is created, it is used to produce proteins during translation. The entire DNA chain is usually not rewritten to MRNA, but instead are specific DNA cuts called transcription units. Enzymes that carry out transcriptions use these codes to start and end the production of RNA chains. The transcription unit is a nucleotide chain in the DNA spring, which starts at the starting code and continues to the end code. This change in terminology has occurred because the research has shown that DNA that is rewritten by Contains by many other nucleotides that are not used to create a protein. DNA slices that are not used for protein code are called introns and slices that perform the protein code are called exony.
often in pThe bottom of the bottom finds much more non -coding introns than exons. The gene is a term used to describe the DNA sequence of nucleotides that code protein. It was assumed that it was continuous, but research has shown that genes are not continuous sources, but are divided into exones in the entire DNA transcription unit.
The transcription unit contains both introns and exons that are coded in RNA enzyme RNA polymerase. After creating a MRNA chain and before it is translated into protein, the introns are removed from RNA. The feling cut off the introns from the MRNA strand and then connect with the remaining pieces to create the final chain that will be used for translation.
The final string of MRNA, which is created after the montage, may not always be the same. The alternative haircut concerns the fact that the same introns can be removed from the MRNA strand, but exony can be connected in different ways. This means that a single transcription unit can actually encode different proteins, since finalThe MRNA sequence may vary based on what the exony is connected together and in what order.