In the double-helical structure of DNA,the tw | vedclass

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(A) The $DNA$ double helix model,proposed by $Watson$ and $Crick$,describes the structure of $DNA$ as two polynucleotide chains that are coiled around

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coiled around a common axis.

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(A) The $DNA$ double helix model,proposed by $Watson$ and $Crick$,describes the structure of $DNA$ as two polynucleotide chains that are coiled around a common axis in a right-handed fashion. The strands are antiparallel and held together by hydrogen bonds between complementary nitrogenous bases. Therefore,the two strands are coiled around a common axis.

In the double-helical structure of $DNA$,the two strands of $DNA$ are:

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