What is the backbone of DNA in the Watson-Crick model formed by?

What is the backbone of DNA in the Watson-Crick model formed by?
  1. Nitrogen bases
  2. Sugar-nitrogen bases chain
  3. Phosphate-nitrogen bases chain
  4. Sugar-phosphate-sugar chain

Solution

The backbone of DNA in the Watson-Crick model is formed by the sugar-phosphate-sugar chain, and the nitrogen bases are projected more or less perpendicular to this backbone but face inside

Asked in: NCERT

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