1. Chapter 25
DNA replication

2. DNA Review DNA is a nucleic acid The components are
Deoxyribose
Phosphate
Nitrogen Base
The nitrogen bases are
Guanine, Cytosine, Adenine, and Thymine
The structure is...
Double helix

3. DNA Replication DNA needs to be replicated so cells may divide
3 steps in replication
Unwinding  The two strands that were held together by hydrogen bonds separate and the hydrogen bonds break. The Enzyme DNA Helicase “unzips” the DNA
Complementary Base Pairing  nucleotides fit into place
Joining  the complementary nucleotides join together to make new strands. They are joined with the enzyme DNA Polymerase

4. This is the Unwinding stage. DNA Helicase
This is where the Nitrogen Base Pairs pair up with the old DNA
DNA Polymerase combines the nucleotides and changes it into a new strand

7. This DNA replication is called Semiconservative because each new double helix has one old strand and one new strand
DNA replication occurs in the nucleus and it needs to happen before cell division
The old strand is called the parent strand
The new strand is called the daughter strand

8. Recombinant DNA