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Antiparallel strands of a DNA molecule means that -

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One strand turns anti-clockwise

One strand turns clockwise

The phosphate groups of two DNA strands, at their ends share the same position.

The phosphate groups at the start of two DNA strands are in opposite position (pole)

answer is B.

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Detailed Solution

At one end of DNA a strand with has PO₄ attached to 5^th carbon of sugar of the strand and opposite to it there is free -OH group at the 3^rd carbon of the sugar of nucleotide of opposing strand.

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