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Molecular Basis of Inheritance question

2000 · Q74
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Molecular Basis of Inheritance question

2000 · Q74

NEETBiologyMolecular Basis of InheritanceMCQ+4 / −1
Length of one loop of B- DNA :
  1. A
    20 nm.
  2. B
    10 nm.
  3. C
    3.4 nm.
  4. D
    0.34 nm.
View written solutionFree

Correct answer: C

B-DNA is an antiparallel double helix. The double strand or duplex is coiled plectonemically in right handed fashion around a common axis like a rope stair case twisted in a spiral. The coiling produces alternate major and minor grooves. One turn of spiral has a distance between two adjacent nucleotides is 3.4 nm.

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