DNA always contain amounts of the four bases,A,G,C,and T,characteristic of the species,but A = T and G = C,and purines equals pyrimidines.

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Chargaff's rules, discovered by Erwin Chargaff, state that in DNA, the amount of adenine (A) always equals the amount of thymine (T), and the amount of guanine (G) always equals the amount of cytosine (C). This is also known as base pairing or complementarity, and it is the basis for the double helix structure of DNA. The rule of purines (A+G) equaling pyrimidines (C+T) also follows from Chargaff's rule. The other options, Hershey and Chase, Franklin, and Watson and Crick, all made significant contributions to our understanding of DNA, but they did not discover Chargaff's rules.

DNA Always Contain Amounts of the Four Bases,A,G,C,and T,characteristic of the Species,but