Which o f the following is not the correct salient feature o f double-helix structure o f DNA?

Question

Which o f the following is not the correct salient feature o f double-helix structure o f DNA? (A) Two polynucleotide chains have backbone of sugar and phosphate and bases project inside (B) Two chains have antiparallel polarity, i.e. one is 5' → 3' and other is 3'→ 5' (C) Adenine forms three hydrogen bonds with thymine and guanine forms two hydrogen bonds with cytosine (D) The plane of one base pair stacks over the other in double helix in addition to H-bond to confer extra statbility to helical structure

Tardigrade Admin · Accepted Answer

Option (c) is incorrect and can be corrected as Adenine forms two hydrogen bonds with thymine of the opposite strand and vice-versa. On the other hand, guanine is bounded with cytosine with three H-bonds. Rest of the options are correct.

Q. Which o f the following is not the correct salient feature o f double-helix structure o f DNA?

Two polynucleotide chains have backbone of sugar and phosphate and bases project inside

Two chains have antiparallel polarity, i.e. one is $5^{'} \to 3^{'}$ and other is $3^{'} \to 5^{'}$

Adenine forms three hydrogen bonds with thymine and guanine forms two hydrogen bonds with cytosine

The plane of one base pair stacks over the other in double helix in addition to H-bond to confer extra statbility to helical structure

Option (c) is incorrect and can be corrected as Adenine forms two hydrogen bonds with thymine of the opposite strand and vice-versa. On the other hand, guanine is bounded with cytosine with three H-bonds. Rest of the options are correct.

Q. Which o f the following is not the correct salient feature o f double-helix structure o f DNA?

Two polynucleotide chains have backbone of sugar and phosphate and bases project inside

Two chains have antiparallel polarity, i.e. one is 5′→3′ and other is 3′→5′

Adenine forms three hydrogen bonds with thymine and guanine forms two hydrogen bonds with cytosine

The plane of one base pair stacks over the other in double helix in addition to H-bond to confer extra statbility to helical structure

Option (c) is incorrect and can be corrected as Adenine forms two hydrogen bonds with thymine of the opposite strand and vice-versa. On the other hand, guanine is bounded with cytosine with three H-bonds. Rest of the options are correct.

Two chains have antiparallel polarity, i.e. one is $5^{'} \to 3^{'}$ and other is $3^{'} \to 5^{'}$