Q74. 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

(3) 2.2 meters

Solution:
The distance between two consecutive base pairs - 0.34nm and
The total number of base pairs of DNA double helix in a typical mammalian cell - 6.6∗10 9 bp.
The length of the DNA would be - Total no. of base pairs ∗ distance between two consecutive base pairs.
Length - 6.6∗10 9×0.34 ∗10 −9

=> 2.24m

vlcsnap-2021-07-19-18h08m15s115.png