In polynucleotide chain, a nitrogenous base is linked to ................... through a N-glycosidic linkage to form a nucleoside. Fill the correct update.
A
The OH of 5′C pentose sugar
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B
The OH of 1′C pentose sugar
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C
The OH of 3′C of pentose sugar
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D
The OH of 5′C of a nucleoside
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Solution
The correct option is B The OH of 1′C pentose sugar Part 1: Composition of a polynucleotide chain
● A polynucleotide molecule is composed of repeating units of nucleotides.
● Each nucleotide is composed of a nucleoside and a phosphate group attached to it at the 5’ carbon atom.
● A nucleoside is composed of a pentose sugar and a nitrogenous base attached to the hydroxyl (−OH) group of it 1’ carbon with the help of a N-glycosidic linkage.
Final answer
(b) The OH of 1′C pentose sugar