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Molecular Basis of Inheritance question

2006 · Q72
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Molecular Basis of Inheritance question

2006 · Q72

NEETBiologyMolecular Basis of InheritanceMCQ+4 / −1
One turn of the helix in a B-form DNA is approximately -
  1. A
    20 nm
  2. B
    3.4 nm
  3. C
    2 nm
  4. D
    0.34 nm
View written solutionFree

Correct answer: B

DNA or deoxyribose nucleic acid is the largest macromolecule made of the helically twisted two antiparallel polydeoxyribonucleotide strands held together by hydrogen bonds. The two strands of DNA are together called DNA duplex. It has a diameter of 20Å. One turn spiral has a distance of 34 Å or 3.4 nm.

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