A) 2.5m
B) 2.2m
C) 2.7m
D) 2.0m
Correct Answer: B
Solution :
[b] The distance between two consecutive base pairs is 0.34 nm \[\left( 0.4\times {{10}^{-9}}m \right)\]. The length of DNA double helix in a typical mammalian cell can be calculated by multiplying the total number of bp with distance between the two consecutive bp, i.e. \[6.6\times {{10}^{9}}\text{ }bp\text{ }\times 0.34\text{ }\times {{10}^{-9}}\text{ }m/bp\text{ }=\]2.2 m (the length of DNA). Thus, option [b] is correct.
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