1. DNA Structure and Replication
DNA is the structure that contains our genetic information.
DNA makes up the chromosomes in our nucleus.
DNA occurs in a twisted-ladder-shape called a double helix.
The rungs of the ladder are made up of repeating phosphate, sugar, phosphate, sugar…. where the sugar is deoxyribose.
The nitrogen bases A,G, C and T make up the rungs of the ladder, connected by weak hydrogen bonds. A pairs with T and G with C.
A=adenine T=Thymine G=Guanine and C=cytosine

2. DNA Structure

3. Replication
Replication is the duplicating of DNA to make 2 identical DNA strands.
The DNA unzips at the hydrogen bonds and the end result is 2 identical DNA strands.
This happens during interphase in mitosis.
or during the first interphase in meiosis.

4. DNA Replication