Chargaff’s rules are applicable to a. Single stranded RNA b. Single stranded DNA and RNA c. Single stranded DNA d. Double stranded DNA
Option D. Chargaff's rules state that DNA from any cell of any organisms should have a 1:1 ratio of pyrimidine and purine bases and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine. This pattern is found in both strands of the DNA. Since single stranded RNA and DNA do not have complementary bases, Chargaff's rule is not applicable to them. So, the correct option is 'Double stranded DNA'.
