Which of the following is not a salient features of the double-helix structure of DNA

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A purine comes opposite to a pyrimidine

Approximately uniform distance between the two strands of the helix

The two chains are coiled in a right -handed fashion

Two chains have parallel polarity

answer is A.

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Detailed Solution

The two chains of double helix structure of DNA have antiparallel polarity . It means that if one chain has the polarity 5'__3',the other chain has the polarity 3'___5'

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