Which from following is NOT a salient feature of Watson and Crick model for DNA?

Which from following is NOT a salient feature of Watson and Crick model for DNA?
  1. Polynucleotide strands wind in to a right handed double helix.
  2. Sugar-phosphate back bone lies at in side and bases lie out side of helix.
  3. Double helix is stabilized by hydrogen bonding formed in two strands.
  4. $\mathrm{A}=\mathrm{T}$ and $\mathrm{G}=\mathrm{C}$ are complementary base pairs.

Solution

In the Watson and Crick model of DNA, the sugar-phosphate backbone lies on the outside of the double helix, and the nitrogenous bases ( $A, T, G, C$ ) are located on the inside of the helix, where they form base pairs. So, option (2) is incorrect.

Asked in: MHT CET 2024 (10 May Shift 1)

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