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Antiparallel strands of a DNA molecule means that

1. the phosphate groups of two DNA strands, at their ends, share the same position
2. the phosphate groups at the start of two DNA strands are in opposite position (pole)
3. one strand turns clockwise
4. one strand turns anti-clockwise

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

Solution

DNA strands run in opposite directions: one strand is oriented 5'→3' while the other is 3'→5'. That means their starting phosphate ends are at opposite poles, which matches the correct choice.

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