Describe semi-conservative DNA replication

The double helix structure unzips which is catalysed by the DNA Helicase enzyme. DNA Helicase overcomes hydrogen bonding between nitrogenous bases. Two strands are produced, each one acts a template. Free DNA nucleotides align with exposed bases following complementary base pairing rules. DNA Polymerase catalyses the joining of adjacent nucleotides to from the sugar-phosphate backbone of the new DNA strand. Hydrogen bonds then form between the bases on each strand and the strands twist to form a double helix. 3 hydrogen bonds form between guanine (G) and cytosine (C), and 2 hydrogen bonds form between adenine (A) and thymine (T). Two identical DNA molecules are produced. Each of the new molecules contains a single strand from the original DNA molecule and a single new strand. Would amount to 6 marks. Each sentence in the first paragraph is a mark.

PA
Answered by Prashant A. Biology tutor

4659 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

For a dihybrid cross, how do you find out what proportion of offspring are expected to have a certain genotype?


Putting bee honey on a cut kills bacteria. Honey contains a high concentration of sugar. Use your knowledge of water potential to suggest how putting honey on a cut kills bacteria.


The events that take place during interphase and mitosis lead to the production of two genetically identical cells. Explain how.


What are the stages of the cell cycle?


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