Antiparallel strands of a DNA molecule means that:
Antiparallel strands of a DNA molecule means that:
one strand turns clockwise
one strand turns anti-clockwise
the phosphate groups of two DNA strands, at their ends, share the same position
the phosphate groups at the start of two DNA strands are in opposite position (pole)
Solution
The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in the opposite directions. One polynucleotide chain grows in the $5^{\prime} \rightarrow 3^{\prime}$-direction and the other chain grows in the $3^{\prime} \rightarrow 5^{\prime}$ direction.