(A) The two strands of the $DNA$ double helix are held together by hydrogen bonds between the nitrogenous bases.Specifically, there is a double hydrog

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(A) The two strands of the $DNA$ double helix are held together by hydrogen bonds between the nitrogenous bases.Specifically, there is a double hydrogen bond between adenine and thymine $(A = T)$ and a triple hydrogen bond between cytosine and guanine $(C \equiv G)$.