Question

Write the nitrogenous bases found in DNA.

Answer 1

Nitrogenous bases: There are two types of nitrogenous bases: purines and pyrimidines.

Purines:
1. Purines are heterocyclic 9 membered ring structures that consist of four nitrogens and five carbons.
2. They have two rings fused together.
3. Adenine and guanine are Purines present in DNA.
Pyrimidines:
1. Pyrimidines are heterocyclic six-membered ring structures with nitrogen at first and third positions.
2. Thymine and cytosine are pyrimidines in DNA. In RNA, uracil is present instead of thymine.