Biologyhard · Past Paper
In a DNA molecule, the strands are 'antiparallel'. This means:
AThey run in the same direction
BThey run in opposite directions (5' to 3' and 3' to 5')
CThey are not parallel
DThey are circular
✓ Correct Answer: B — They run in opposite directions (5' to 3' and 3' to 5')
Antiparallel means the sugar-phosphate backbones run in opposite directions, which is essential for replication and pairing.
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