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  4. Which is not consistent with double helical structure of DNA?

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Q. Which is not consistent with double helical structure of DNA?

AIPMTAIPMT 1990Biomolecules

Solution:

The density of DNA decreases on heating as hydrogen bonds breakdown. According to ChargafFs 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 form species to species, but is constant for a given species.