Chargaff’s rule states that DNA from any cell of any organism has a 1:1 ratio of pyrimidine and purine bases and more specifically that the amount of guanine a purine base is equal to cytosine a pyrimidine base; and the amount of adenine a purine base is equal to thymine a pyrimidine base.
So a base pair is composed of a pyrimidine base and a purine base. This pattern is found in both strands of DNA and is responsible for the base-pairing rule which states that adenine always pairs with thymine and guanine always pairs with cytosine..
The nitrogen bases pair with each other by means of hydrogen bonds.

Leave a Reply

Your email address will not be published. Required fields are marked *