Question

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

• A. One nucleotide with the another nucleotide
• B. One nucleoside with another nucleoside
• C. One deoxyribose sugar with another nucleoside
• D. One nitrogenous base with pentose sugar

Answer 1

Answer: (A)

One nucleotide with the another nucleotide

Each strand of DNA consist of number of nucleotides. The successive nucleotides of the same strand are linked by 3'-5' phosphodiester linkages i.e., 3' carbon of one sugar and 5' carbon of another sugar. This bond is strong covalent bond formed by one phosphate group and two ester groups at pentose sugars. Thus option A is the correct answer.