Summary
Summary notes on DNA replication - AQA A Level Biology
- Institution
- AQA
Summary notes on DNA replication - AQA A Level Biology Made the notes myself during A Levels A* and A quality 3 page document with diagrams and notes
[Show more]
Content preview
3.1.5.2 DNA replication – AQA A Level Biology Summary NotesThe semi-conservative nature of DNA ensure genetic continuity between generations of cells
Before a cell divides by mitosis, it must replicate its DNA, causing chromosome to go from consisting
of one chromatid to two chromatids
- This is important because during mitosis chromatids are pulled away from each other,
therefore resulting in daughter cells receiving the same genetic information as the parent
cell
For genetic continuity, each sister chromatid must be identical to the other. This is ensured because
the DNA replicates semi-conservatively: one strand from a parent DNA molecule is always used a a
template from which a second new strand can be created
The processes of semi-conservative replication of DNA
1) DNA double helix is unwound and unzipped by DNA helicase breaking the hydrogen bonds
between the complementary bases in the polynucleotide strands. Both strands now act as
template strands
2) DNA nucleotides which are free in the nucleus are attracted to the exposed bases on the
template strands and complementary base pairing occurs: A and T, C and G
3) Adjacent DNA nucleotides are joined together in condensation reactions, forming
phosphodiester bonds, catalysed by the enzyme DNA polymerase
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller studytogether. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £4.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
84866 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now