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(B) The $DNA$ double helix consists of two polynucleotide chains that run in opposite directions,which is referred to as antiparallel polarity.This or

Vedclass · Accepted Answer

Phosphodiester bonds

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(B) The $DNA$ double helix consists of two polynucleotide chains that run in opposite directions,which is referred to as antiparallel polarity.This orientation is primarily determined by the $3'-5'$ phosphodiester linkages that connect the nucleotides in the sugar-phosphate backbone.While $H$-bonds are responsible for holding the two strands together via complementary base pairing,the antiparallel nature itself is a consequence of the chemical orientation of the phosphodiester bonds in the backbone.

$DNA$ strands are antiparallel because of:

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