The strands in the double helix
A) both run in the same 3' → 5' direction, i.e., they are parallel.
B) have their 3' → 5' directions opposed, i.e., they are anti-parallel.
C) can be either parallel or anti-parallel.
D) are perpendicular to one another.
E) None of these

Question

Quizplus · Accepted Answer

The strands in the double helix of DNA are anti-parallel, meaning one strand runs in the 3' → 5' direction while the other runs in the 5' → 3' direction.

The Strands in the Double Helix