What are the main components of a DNA molecule as described in the Double-helix structure?

What are the main components of a DNA molecule as described in the Double-helix structure?
  1. Nitrogenous bases and sugar-phosphate
  2. Hydrogen bonds and nitrogenous bases
  3. Nitrogenous bases and H-bonds
  4. Sugar-phosphate and Hydrogen bonds

Solution

The Double-helix structure of DNA is made up of two polynucleotide chains, where the backbone is constituted by sugar-phosphate, and the nitrogenous bases project inside.

Asked in: NCERT

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