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NEETZoologyMolecular Basis of Inheritance

What confers stability to the helical structure of the Double-helix structure of DNA?

Options

  1. AHydrogen bonds
  2. BCovalent bonds
  3. CIonic bonds
  4. DHydrogen bonds and the stacking of the base pairs

Correct answer

D. Hydrogen bonds and the stacking of the base pairs

Step-by-step solution

The salient features of the Double-helix structure of DNA are as follows: (i) It is made of two polynucleotide chains, where the backbone is constituted by sugar-phosphate, and the bases project inside. (ii) The two chains have antiparallel polarity. It means, if one chain has the polarity 5'🡪3', the other has 3’🡪5'. (iii) The bases in two strands are paired through hydrogen bond (H-bonds) forming base pairs (bp). Adenine forms two hydrogen bonds with Thymine from opposite strands and vice-versa. Similarly, Guanine

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