Describe the process of DNA transcription

DNA is contained in the nucleus of a cell, and is in double-helix form with a sense strand and complimentary anti-sense strand. The two strands have bases hydrogen-bonded to each other with sugar phosphate backbones. Transcription is the process of forming an mRNA strand from the sense strand of DNA so that proteins can be formed in the cell during translation.Firstly, the double helix of DNA is unwound by DNA helicase. Secondly, complimentary base pairing occurs to this sense strand working in the 5' to 3' direction by RNA primase. A pairs with T and G pairs with C. T does not exist in mRNA and is Uracil (U) instead.Now, mRNA has been formed. Mature mRNA is formed when introns (non-coding areas of DNA) are cleaved out of the mRNA. The mature mRNA now moves out of the nucleus into the cytoplasm where it may bound to ribosomes for translation to take place.