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: Phosphodiester bonds connect the phosphate group of one nucleotide to the sugar of another, forming the backbone of a polynucleotide chain.
This bond is known as an N-glycosidic linkage. It connects the 1' carbon of the pentose sugar to the nitrogen atom of the nitrogenous base.
Other bonds in the polynucleotide structure:
Phosphodiester bond: Links the sugar molecules of adjacent nucleotides. Hydrogen bond: Occurs between complementary nitrogenous bases in double-stranded DNA.
Peptide bond: Found in proteins, not in polynucleotides.