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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2.0 meters

2.5 meters

2.7 meters

2.2 meters

answer is B.

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Detailed Solution

Length of DNA = Total number of base pairs X length of each base pair or length of a nucleotide in each strand of DNA

Length of each base pair = 0.34 nm or 0.34 X 10^-9 m

Number of base pairs in a mammalian cell = 6.6 X 10⁹ bp

The length of DNA = 6.6 X 10⁹ bp X 0.34 nm = 2.244 m

It is approximately 2.2 m.

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