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 $6.6 x 10^{9} b p$ , then the length of the DNA is aproximately:

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2.5 meters

2.2 meters

2.7 meters

2.0 meters

answer is B.

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Detailed Solution

The length of DNA can be calculated by following formula.
Distance between adjacent base pair x total number of base pair in diploid cell.
$6.6 x 10^{9} (b p) x 0.34 x 10^{- 9} (m) = 2.2 m$

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