Q. If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is $6.6 \times 10^9$ bp, then the length of the DNA is approximately :
A) 2.5 meters
B) 2.2 meters
C) 2.7 meters
D) 2.0 meters
Explanation
[Solution] Length = $6.6 \times 10^9 \times 0.34 \times 10^{-9}$ m = 2.244 m, approximately 2.2 m. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.