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(B) $1$. $RNA$ is typically single-stranded,not double-stranded.$2$. According to the $Watson-Crick$ model,the two strands of $DNA$ are coiled togethe

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Both strands of $DNA$ are coiled together in a specific manner.

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(B) $1$. $RNA$ is typically single-stranded,not double-stranded.$2$. According to the $Watson-Crick$ model,the two strands of $DNA$ are coiled together in a specific right-handed helical manner.$3$. In $DNA$,purines ($Adenine$,$Guanine$) always pair with pyrimidines ($Thymine$,$Cytosine$) via hydrogen bonds,not purine-purine or pyrimidine-pyrimidine.$4$. The distance between the two strands of $DNA$ (the diameter of the helix) is approximately $20 \ \mathring A$,while the distance per turn is $34 \ \mathring A$. Therefore,statement $B$ is the only correct statement.

Select the correct statement from the following.

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