Question

The type of bond represented by the dotted line ‘-----’ in a schematic polynucleotide chain is: 

• A. Hydrogen bond
• B. Peptide bond
• C. N-glycosidic linkage
• D. Phosphodiester bond

Hint:

Identify bonds in biomolecules: N-glycosidic linkage: Between sugar and base in nucleotides. Phosphodiester bond: Backbone of DNA/RNA. Hydrogen bond: Holds DNA strands together. Peptide bond: Found in proteins.

Answer 1

The Correct Option is C

Explanation: The backbone of a polynucleotide chain is formed by phosphodiester bonds, which link the phosphate group of one nucleotide to the sugar of another.
An N-glycosidic linkage connects the 1' carbon of the pentose sugar to the nitrogen atom of the nitrogenous base.
Additional bonds present in polynucleotide structures include:
Phosphodiester bond: Connects the sugar molecules of adjacent nucleotides.
Hydrogen bond: Forms between complementary nitrogenous bases in double-stranded DNA.
Peptide bond: Found in proteins, not in polynucleotides.