DNA consists of nucleotides that contain bases and form a double helix structure. The nucleotides are the subunits that make up genes which are found on chromosomes. Rosalind Franklin's x-ray crystallography discoveries of the DNA molecular structure were key to allowing Watson and Crick to propose their correct double helix molecular model of DNA in 1953.

1. Whatdoes DNA look like ?

2. Genes Chromosomes

3. Nucleotides: Thesubunits of DNA

4. Nucleotide bases

5. Chargaff´s Rules

6. Franklin´sdiscoveries

7. Watson and Crick´sModel Watson Crick

8. DNA’sdoubleStructure