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NTA Abhyas NEET2020ChemistryBiomoleculesPractice

Length of one coil of B-DNA helix is

Options

  1. A0.34 nm
  2. B3.4 nm
  3. C3.4 Å
  4. D0.34 Å

Correct answer

B. 3.4 nm

Step-by-step solution

DNA is a double helical structure with two anti-parallel strands with 5 I to 3 I polarity. The two strands coil in a right-handed fashion. Each turn of the helix is 3.4nm (or 34 Angstrom units) consisting of 10 nucleotides.

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