Explain how transcription of genes occurs

Transcription occurs in the nucleus of the cell.The enzyme DNA helicase catalyses the 'unzipping' or splitting of the two DNA chains in the region of the gene by catalysing the breaking of the hydrogen bonds holding the chains together.RNA polymerase catalyses complementary mRNA nucleotides to form a complementary strand with the exposed bases. mRNA bases are ACGU rather than ACGT as in DNA.The mRNA then leaves the nucleus to carry the information of how to make the protein coded by the gene to the ribosomes. Each gene codes for the formation of one protein.The mRNA is a very small molecule and so can pass through the nuclear pore into the cytoplasm to travel to the ribosomes.

Answered by Vanessa T. Biology tutor

2207 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

Briefly describe how a vaccine works.


Smoking is a risk factor for many types of cancer. Explain how smoking can affect the development of cancer. Define risk factors in your answer.


Explain the Theory of Natural Selection


Describe a simple food chain and the trophic levels within it


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