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The two chains are antiparallel, one aligned in 5'→3' direction the other in 3'→5' direction.

1. DNA chains are parallel.
2. DNA chains are antiparallel.
3. DNA chains are perpendicular.
4. DNA chains are circular.

Correct answer: DNA chains are antiparallel.

Solution

The statement says one chain is oriented 5'→3' and the other 3'→5', meaning they run in opposite directions. That opposite orientation is called antiparallel.

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