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Solution


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 6.6×109 bp, then the length of the DNA is approximately          [2020]
1 2.0 meters  
2 2.5 meters  
3 2.2 meters  
4 2.7 meters  

Ans.

(3)

If the distance between two consecutive base pairs is 0.34 nm i.e.,0.3×10-9 m and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6×109 bp, the length of DNA is calculated by multiplying the total number of base pairs with distance between two consecutive base pairs i.e., 6.6×109 bp × 0.34 nm = 2.2 m (approx.)