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प्रश्न
What is the diameter of the DNA double helix as proposed by Watson and Crick?
पर्याय
10 Å
3.4 nm
2 nm
34 Å
MCQ
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उत्तर
The DNA double helix has a uniform diameter of 2 nanometers (nm) according to Watson and Crick's model. The distance between adjacent base pairs is 3.4 ångströms (Å), which equals 0.34 nm. This uniform dimension is maintained because each purine-pyrimidine base pair combination has approximately the same width, contributing to the helix's regular cylindrical structure.
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