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NEETZoologyMolecular Basis of Inheritance

What is the distance between two consecutive base pairs in a DNA double helix?

Options

  1. AApproximately 2.2 meters
  2. BApproximately 0.34 nm
  3. CApproximately 1.36 mm
  4. DApproximately 6.6 × 10⁹ bp

Correct answer

B. Approximately 0.34 nm

Step-by-step solution

Taken the distance between two consecutive base pairs as 0.34 nm (0.34×10–9 m) , if the length of DNA double helix in a typical mammalian cell is calculated (simply by multiplying the total number of bp with distance between two consecutive bp, that is, 6.6 × 109 bp × 0.34 × 10-9m/bp), it comes out to be approximately 2.2 meters. A length that is far greater than the dimension of a typical nucleus (approximately 10–6 m). How is such a long polymer packaged in a cell? If the length of E. coli DNA is 1.36 mm, can you

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