In a DNA molecule,the purine and pyrimidine b | vedclass

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(A) In the $DNA$ double helix structure,the two strands are held together by hydrogen bonds ($H$-bonds) between the nitrogenous bases.According to Cha

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$H$-bonds

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(A) In the $DNA$ double helix structure,the two strands are held together by hydrogen bonds ($H$-bonds) between the nitrogenous bases.According to Chargaff's rule and the base-pairing principle,Adenine $(A)$ always pairs with Thymine $(T)$ via two $H$-bonds,and Guanine $(G)$ always pairs with Cytosine $(C)$ via three $H$-bonds.These hydrogen bonds provide stability to the $DNA$ double helix structure.

In a $DNA$ molecule,the purine and pyrimidine bases of complementary strands are linked together by:

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