(A) In the structure of $DNA$,nitrogenous bases pair with each other through hydrogen bonds. $Adenine$ $(A)$ always pairs with $Thymine$ $(T)$ via two

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(A) In the structure of $DNA$,nitrogenous bases pair with each other through hydrogen bonds. $Adenine$ $(A)$ always pairs with $Thymine$ $(T)$ via two hydrogen bonds,while $Guanine$ $(G)$ pairs with $Cytosine$ $(C)$ via three hydrogen bonds. Therefore,there are two hydrogen bonds between $A$ and $T$.