Which of the following statements regarding DNA is incorrect?

The two strands run antiparallelly

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Adenine pairs with thymine through three H-bonds

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Purine always pairs with pyrimidine

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Guanine pairs with cytosine through three H-bonds

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Solution

The correct option is B Adenine pairs with thymine through three H-bonds
● In a double-stranded DNA, adenine pairs with thymine through two H-bonds.
● The two strands of DNA run antiparallely and purine always pairs with pyrimidines.

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