(B) The structure of $DNA$ (Deoxyribonucleic acid) is a double helix. It consists of two polynucleotide chains that run in an anti-parallel direction.

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(B) The structure of $DNA$ (Deoxyribonucleic acid) is a double helix. It consists of two polynucleotide chains that run in an anti-parallel direction. These two chains are coiled around a common axis and are held together by hydrogen bonds between the nitrogenous bases.