DNA Structure



DNA is a polymer
What is DNA?

DNA Backbone

DNA backbone is a polymer with an alternating sugar-phosphate sequence.

DNA Double Helix

Double stranded macromolecule winded together

Purine and Pyrimidine

Purines have two rings

- Adenine and Guanine are purines

Pyrimidines have one ring

- Cytosine and Thymine are pyrimidine

The deoxyribose sugar of the DNA backbone has 5 carbons and 3 oxygens.


Nucleotides form the basic structural unit of nucleic acids such as DNA.

Base Pairs

Adenine, Guanine, Thymine, and Cytosine.