<prompt> In a sample of dsDNA, the molar ratio of Adenosine is 20. From this information, tell the content of Cytosine?10203040  <response>: According to chargaffs rule in a ds DNA, the total purine content is equal to the pyrimidine content. Since , so 20 2020 40 100- 100-40 60 As , so 602 30 Chargaff Rule 1. Total number of purine AG is equal to total number of pyrimidine CT I.e. A G C T I 2. A T or AT I 3. G C or GC I 4. The numbers of AT and GC are only varibales, i.e., A T ? G C If AT GC then DNA is referre as AT-type. If GC AT then DNA is referred as GC-type. Chargaffs Rule only applies to double-stranded DNA, due to the complementary base pairing that occurs between A-T and C-G. 