List the Salient Features Of Double Helix Model In DNA
Class 12th
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1. Answer:

   The salient features of double helix structure of DNA are as follows: There are two polynucleotide chains in a double stranded DNA. The backbone is constituted by sugar phosphate. The two strands possess anti-parallel polarity, means one chain has polarity 5′-3′ and the other has 3′-5′.

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2. Answer:

   The salient features of double helix structure of DNA are as follows:

   • There are two polynucleotide chains in a double stranded DNA.
   • The backbone is constituted by sugar phosphate.
   • The two strands possess anti-parallel polarity, means one chain has polarity 5’-3’ and the other has 3’-5’.
   • The two strands of DNA are joined together by hydrogen bonds between purines and pyrimidines.
   • Adenine always pairs with Thymine by two hydrogen bonds and Guanine always pairs with Cytosine by three hydrogen bonds.
   • The two chains are coiled around each other where the pitch of the helix is 3.4 nm and distance between two base pairs is 3.4 A° (as in case of B-DNA)
   • The backbone of DNA double helix is formed by sugars and phosphates where bases are projecting inwards.

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