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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 x 109 bp, then the length of the DNA is aproximately:

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a

2.0 meters

b

2.5 meters

c

2.7 meters

d

2.2 meters

answer is B.

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Detailed Solution

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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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