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(A) According to Chargaff's rules and the structure of the $DNA$ double helix proposed by Watson and Crick,nitrogenous bases pair specifically through

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Cytosine

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(A) According to Chargaff's rules and the structure of the $DNA$ double helix proposed by Watson and Crick,nitrogenous bases pair specifically through hydrogen bonds.In $DNA$,guanine $(G)$ always forms three hydrogen bonds with cytosine $(C)$.Adenine $(A)$ always forms two hydrogen bonds with thymine $(T)$.Therefore,guanine pairs with cytosine.

In $DNA$,guanine pairs with:

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