Name the pyrimidine bases present in DNA.

Bases in DNA:

1. The nitrogenous bases are of two types: Purines and Pyrimidines.
2. Purines are bases having two carbon-nitrogen rings while pyrimidines are bases containing one carbon-nitrogen ring.
3. DNA has four types of nitrogenous bases: Adenine, Guanine, Thymine, and Cytosine.
4. Adenine and guanine are purines while thymine and cytosine are pyrimidines.
5. Two bases link by a hydrogen bond and form base pairs.
6. Base pairs in DNA are Adenine - Thymine, and Guanine - Cytosine.

Thus, the pyrimidine bases present in DNA are thymine and cytosine.