What is the length of DNA double helix in a typical mammalian cell?

What is the length of DNA double helix in a typical mammalian cell?
  1. Approximately 10⁻⁶ m
  2. Approximately 0.34 nm
  3. Approximately 2.2 metres
  4. Approximately 6.6 × 10⁹ bp

Solution

The length of DNA double helix in a typical mammalian cell is approximately 2.2 metres (by multiplying the total number of bp with distance between two consecutive bp, that is, 6.6 × 10⁹ bp × 0.34 × 10^⁻⁹ m/bp).

Asked in: NCERT

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