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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance1 Mark
MCQ
Length of one loop of B DNA is:
  • A
    3.4nm
  • B
    0.34nm
  • C
    20nm
  • D
    10nm
✓

Answer

  1. 3.4nm

Explanation:

In B-DNA, the most common double helical structure, the double helix is right-handed with about 1010.5 nucleotides per turn.The double helix structure of DNA contains a major groove and minor groove, the major groove being wider than the minor groove. The length of one loop of B-DNA is 3.4nm.

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