Molecular Basis of Inheritance Question 1
1. 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 $6.6 \times 109 bp$, then the length of the DNA is approximately
(a) 2.5 meters
(b) 2.2 meters
(c) 2.7 meters
(d) 2.0 meters
Show Answer
Answer : b
Hints & Solution
(b) Length of DNA $=[0.34 \times 10-9] m \times 6.6 \times$ $109 bp=2.2 m$ Distance between 2 base pair in DNA helix $=$ $0.34 nm=0.34 \times 10-9 m$ Total number of base pair $=6.6 \times 109 bp$
