Q. The 3′-5′ phosphodiester linkages inside a polynucleotide chain serve to join
A) One DNA strand with the other DNA strand
B) One nucleoside with another nucleoside
C) One nucleotide with another nucleotide
D) One nitrogenous base with pentose sugar
Explanation
[Solution from source] In a polynucleotide, the phosphate of one nucleotide links the 3′-carbon of one sugar to the 5′-carbon of the next, so a 3′-5′ phosphodiester bond joins successive nucleotides. The two DNA strands are held together by hydrogen bonds, and a base is joined to its sugar by an N-glycosidic bond. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.