Q. Antiparallel strands of a DNA molecule means that :
A) one strand turns anti-clockwise
B) the phosphate groups of two DNA strands, at their ends, share the same position
C) the phosphate groups at the start of two DNA strands are in opposite position (pole)
D) one strand turns clockwise
Explanation
[Solution from source] The two strands of DNA run in opposite directions, one 5'→3' and the other 3'→5', so the phosphate end (5') of each strand lies at opposite ends of the molecule. Both strands turn the same way in a right-handed helix. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.