Anti-parallel strands of a DNA molecule mean that

Q. Anti-parallel strands of a DNA molecule mean that

1. One strand turns anticlockwise
2. Phosphate groups at the start of two DNA strands (poles) are in opposite position
3. Phosphate groups of two DNA strands at their ends share the same position
4. One strand turns clockwise

Answer: Phosphate groups at the start of two DNA strands (poles) are in opposite position