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List any four salient features of Watson-Crick model of DNA. |
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Answer» Four salient features of Watson and Crick model are: (i) DNA molecule consist of two polynucleotide chains, which are coiled like a rope in helical fashion. So the two strands form a double helix’. (ii) The two strands of a Polynucleotides are antiparallel i.e., run in the opposite direction. The backbone is formed by the sugar-phosphate-sugar chain with the nitrogenous bases projected inside. (iii) Each DNA helix has alternate minor and major groove having width of 12 Å and 22 Å respectively. (iv) The distance between two consecutive spirals is 34 Å Thus, between two consecutive spirals, 10 nucleotides can be adjusted. |
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