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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 × 10⁹ bp, then the length of the DNA is approximately

1. 2.5 meters
2. 2.2 meters
3. 2.7 meters
4. 2.0 meters

Correct answer: 2.2 meters

Solution

The DNA length is the number of base pairs times the distance between adjacent base pairs. Using 0.34 nm per bp and 6.6 × 10^9 bp gives 2.244 × 10^9 nm, which is about 2.2 m after unit conversion.

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