Describe the sequence of events in DNA transcription

An enzyme called DNA helicase breaks the hydrogen bonds holding the complimentary base pairs together in a double stranded DNA molecule. This causes the DNA helix to unwind, exposing the unpaired bases. Another enzyme called RNA polymerase binds to a 'promotor' region on the exposed DNA strand and moves downstream, attaching free complementary mRNA nucleotides to the exposed DNA bases. This strand of mRNA is released to form a strand of pre-mRNA. The non-coding regions called introns are removed via RNA 'splicing', resulting in a strand of coding mRNA.

EM
Answered by Ellie M. Biology tutor

2903 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Why are nitrogen and phosphorus vital in photosynthesising plants


Use your knowledge of the actin and myosin mechanism of muscle contraction to explain how a vesicle might be "walked" along the cytoskeleton of a cell.


Describe how the sequence of bases in a DNA molecule would be used to form the primary structure of a protein.


How does base deletion in the DNA code produce a nonfunctional protein?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences