Which of the following represent Chargaff's rule

Options :
  1. Purines and pyrimidines occur in equal amounts
  2. Base composition of DNA varies from one species to another
  3. Molar ratio of adenine to thymine and that of guanine to cytosine is 1:1
  4. All of these

Answer and Explanation :-

Answer: Option 4


In addition, Base ratio A + T/C + G is specific for a species

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