NEET 2010 Biology question

The 3'-5' phosphodiester linkages inside a polynucleotide chain serve to join

(1)One nitrogenous base with pentose sugar
(2)One DNA strand with the other DNA strand
(3)One nucleoside with another nucleoside
(4)One nucleotide with another nucleotideCorrect

Answer: (4)

Solution

In a polynucleotide chain the 3'-OH of the pentose sugar of one nucleotide is joined to the 5' phosphate of the next nucleotide by a 3'-5' phosphodiester bond (ester bonds with the phosphate group on both sides). So the phosphodiester linkage joins one nucleotide with another

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Question ID VK-090452