Correct Answer: C
Explanation:
(c): The density of DNA decreases on heating as hydrogen bonds breakdown. According to Chargaff’s rules, the amount of adenine is always equal to that of thymine, and the amount of guanine is always equal to that of cytosine i.e., A = T and G = C. The base ratio A + T/ G + C may vary from species to species, but is constant for a given species