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

5424 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

How are action potentials transmitted from one nerve to another?


Describe the process of oxidative phosphorylation


Explain the role of the loop of Henle in producing concentrated urine.


Describe the process of natural selection


We're here to help

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

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning