Which of the following statements with respect to the orientation of the nitrogenous bases to the pentose sugars and the puckering of the sugar is correct Gate Biotechnology 2014 question paper

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Which of the following statements with respect to the orientation of the nitrogenous bases to the pentose sugars, and the puckering of the sugar, is correct? - Gate Biotechnology 2014 question paper

(A) Anti, and 2’-endo in A form DNA 
(B) Anti, and 2’-endo in B form DNA 
(C) Syn, and 3’-endo in A form DNA 
(D) Syn, and 3’ -endo in B form DNA


By:Aparna-Dasgupta

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 Anti, and 2’-endo in B form DNA 

2’-deoxyribose is the sugar in DNA and ribose is the sugar in RNA: 
in nucleic acids are syn and anti. The anti conformation of the glycosidic bond typical for DNA allows specific hydrogen bond formation between the base paired bases in DNA double helix Two preferred conformations of pentose sugar (sugar puckers) are 2’ endo (2’- OH is pointing the same way as the base) and 3’ endo (3’-OH is pointing the same way as the base). Sugar conformation is critical for the nucleic acid structure because it defines how the nucleotides are linked to each other in space. So, the orientation of the nitrogenous bases to the pentose sugars, and the puckering of the sugar, is done in Anti, and 2’-endo in B form DNA. 


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