DNA contains deoxyribose
DNA is a nucleic acid
There are 4 possible different nitrogen bases: adenine, guanine, cytosine, thymine
DNA is a double stranded molecule which is connected by the nitrogen bases.
Adenine can only pair with thymine (and vice versa).
Guanine can only pair with cytosine (and vice versa).
Purines - double ringed structures - adenine and guanine are purines
Pyrimidines - sing ring structures - thymine and cytosine are pyrimidines.