Describe the process in which DNA replication occurs (6 marks)

Firstly, the enzyme DNA helicase separates the two strands in DNA by breaking the hydrogen bonds between them. Both of the two strands then act as templates to which free nucleotides attach to. This attachment occurs by complementary base pairing, where cytosine and guanine bases join, and adenine and thymine bases join. The enzyme DNA polymerase then moves up the new strands, joining the nucleotides on them with phosphodiester bonds. The hydrogen bonds between bases reform, and the DNA has successfully replicated by semi-conservative replication.

Answered by Biology tutor

5122 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Name how the structure of the three main blood vessels are adapted to their function.


How are phospholipids arranged in the cell membrane?


Describe a biochemical test that could be used to determine the presence of triglycerides in a sample of food.


Describe how glucose is taken up by cells?


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