Q153 / 180 · NEET 2020 (Phase 1) · Zoology

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 6.6×109bp bp, then the length of the DNA is approximately

  • A
    2.5 meters
  • Correct answer
    B
    2.2 meters
  • C
    2.7 meters
  • D
    2.0 meters

Solution

Given the distance between two consecutive base pairs is 0.34 nm=0.34×10-9 m.

A total number of bases =6.6×109 bp.

Length of DNA = Total no. of bp×Distance between two consecutivebp

= 6.6×109×0.34×10-9

=2.24 m

Hence, the correct answer is option: 'B'.

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