Describe the process of transcription

Transcription takes place in the nucleus and is the first stage of protein synthesis. RNA polymerase attaches to the DNA double helix at the promoter sequence and unwinds the helix by breaking the hydrogen bonds. Complementary free RNA nucleotides are lined up alongside the exposed bases and are joined together by RNA polymerase. The RNA polymerase continues down the double helix forming the mRNA molecule, and once the polymerase has passed, the two strands of DNA rejoin to form the helix. Once a stop signal is reached, RNA polymerase detaches from the DNA and the mRNA molecule exits the nucleus through a nuclear pore and into the cytoplasm.

Answered by Jess D. Biology tutor

2935 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

What are the two types of nucleotide bases which make up DNA, and which bases bond with one another? What is the difference with these bases in RNA?


How is selective reabsorption acheived in the kidneys?


How is ATP used in myofibril contraction?


How does the human body regulate its blood glucose levels?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences