1. Watson and Crick
Using information from many researchers of their time, they assembled the first complete model of DNA as a double helix in 1953
Double helix = two strands of DNA twisted into a spiral staircase
Their model explained 2 things:
How information is stored in DNA
How DNA could be copied
They won the Nobel Prize in 1962.

2. Notes – Structure of DNA

3. DNA is a polymer

4. DNA is a polymer Nucleotide monomers have 3 parts: Phosphate group
Sugar (deoxyribose)
Nitrogenous Base:

5. DNA is a polymer Nucleotide monomers have 3 parts: Phosphate group
Sugar (deoxyribose)
Nitrogenous Base:
Guanine (G)
Thymine (T)
Adenine (A)
Cytosine (C)

6. DNA is double-stranded

7. DNA is double-stranded
Two strands of nucleotides are held together by hydrogen bonds

8. DNA is double-stranded
Two strands of nucleotides are held together by hydrogen bonds
Base-pairs: The two strands have A bonded to T and G bonded to C

9. DNA is double-stranded
Two strands of nucleotides are held together by hydrogen bonds
Base-pairs: The two strands have A bonded to T and G bonded to C
The two strands are complementary and are arranged in opposite directions

10. Eukaryotic DNA forms chromatin
Chromatin = DNA wrapped around proteins
During cell division, chromatin condenses into chromosomes

11. Eukaryotic DNA forms chromatin
Chromatin = DNA wrapped around proteins
During cell division, chromatin condenses into chromosomes