The two polynucleotide chains in a DNA are

Parallel

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Discontinuous

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Antiparallel

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Semiconservative

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Solution

The correct option is C Antiparallel
DNA strands are antiparallel in nature. While one strand of the double-stranded DNA runs the in 5' $\to$ 3' direction the other strand is placed parallel to it in the reverse direction i.e. 3' $\to$ 5' direction.
So, the correct answer is (C).

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Why the distance between two polynucleotide chains in dna remain almost constant

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