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Antiparallel strands of DNA have two strands having phosphate groups at same positions in space.

1. Antiparallel strands of DNA have phosphate groups at opposite ends.
2. Antiparallel strands of DNA have phosphate groups at the same ends.
3. Antiparallel strands of DNA have phosphate groups at random positions.
4. Antiparallel strands of DNA have no phosphate groups.

Correct answer: Antiparallel strands of DNA have phosphate groups at opposite ends.

Solution

In antiparallel DNA, the two sugar-phosphate backbones run in opposite directions. That means the phosphate-containing ends are positioned oppositely, not aligned the same way.

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