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Solution


Q.

If the length of a DNA molecule is 1.11 metres, what will be the approximate number of base pairs         [2022]
1 3.3×109 bp  
2 6.6×10⁹ bp  
3 3.3×106 bp  
4 6.6×106 bp  

Ans.

(1)

Length of DNA double helix = Total number of bp × Distance between two consecutive bp.

So, total number of bp = Length of DNA double helixDistance between two consecutive bp

                                   = 1.11 metres0.34×10-9 m/bp=3.26×109bp

Therefore, approximate number of base pair will be 3.3×109 bp.