Q. In a double helix DNA, if one chain has polarity 5’ → 3’, the other chain around will have
A) thymine instead of uracil.
B) antiparallel polarity in 3’ → 5’ direction.
C) similar polarity in 5’ → 3’ direction but different base pairs.
D) antiparallel polarity in 3’ → 5’ direction and uracil instead of thymine.
Explanation
The two chains in a double helix DNA has antiparallel polarity. If one chain has 5’ → 3’ polarity, then the other one would have 3’ → 5’ polarity.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.