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NEETZoologyMolecular Basis of Inheritance

A linear segment of B-DNA has a length of 34 m . Assuming that a typical nucleosome contains 200 base pairs of DNA helix, what is the maximum number of nucleosomes that can be formed from this segment?

Options

  1. A500
  2. B100,000
  3. C5000
  4. D50

Correct answer

A. 500

Step-by-step solution

Length of the B-DNA segment = 34 m = 34 10⁻⁶ m Distance between two consecutive base pairs = 0.34 nm = 0.34 10⁻⁹ m Total number of base pairs in the segment = 34 10⁻⁶ 0.34 10⁻⁹ = 100,000 bp Number of base pairs in one typical nucleosome = 200 Maximum number of nucleosomes = 100,000 200 = 500 The option 100,000 represents only the number of base pairs, missing the final step. Options with 50 or 5000 result from incorrect unit conversions. Answer: 500

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