What is the reason for the anti-parallel natu | vedclass

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(D) The $DNA$ double helix consists of two polynucleotide chains that run in opposite directions,a property known as anti-parallelism. This orientatio

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None of the above

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(D) The $DNA$ double helix consists of two polynucleotide chains that run in opposite directions,a property known as anti-parallelism. This orientation is primarily determined by the chemical structure of the sugar-phosphate backbone,where the $5'$ end of one strand is aligned with the $3'$ end of the other. While hydrogen bonds hold the nitrogenous bases together,they do not dictate the anti-parallel orientation itself. Phosphodiester bonds link the nucleotides within a single strand,but the anti-parallel arrangement is a structural consequence of the polarity of the deoxyribose sugar and the specific orientation of the phosphodiester linkages between the $3'$ and $5'$ carbons. Therefore,none of the provided bond types are the direct cause of the anti-parallel nature; it is a result of the molecular geometry of the nucleotides.

What is the reason for the anti-parallel nature of $DNA$ strands?

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