Identify the correct options with respect to the salient features of DNA.
(A) The two polynucleotide chains are coiled in a left-handed fashion
(B) Adenine forms three hydrogen bonds with thymine
(C) The distance between a base pair in a DNA helix is approximately 0.34 nm
D) The plane of one base pair stacks over the other in double helix (
Choose the correct answer from the options given below :
(
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Shift 22/05/2023 8:30 AM - 10:30 AM
Correct Answer
Detailed Explanation
Salient features of DNA are :-
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 strand and vice-versa. Similarly, Guanine is bonded with Cytosine with three H-bonds. As a result, always a purine comes opposite to a pyrimidine.
The two chains are coiled in a right-handed fashion. The pitch of the helix is 3.4 nm. The distance between a bp in a helix is approximately 0.34 nm.
The plane of one base pair stacks over the other in double helix. This, in addition to H-bonds, confers stability of the helical structure
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