Question

Bond present between two nucleotides on a single strand of DNA is:

• A. Phosphodiester bond.
• B. Hydrogen bond.
• C. Glycosidic bond.
• D. Covalent bond.

Hint:

Phosphodiester bonds form the sugar-phosphate backbone in a single DNA strand, while hydrogen bonds link the complementary bases between strands.

Answer 1

The Correct Option is A

Step 1: DNA bond formation. Nucleotides in a DNA strand are joined by phosphodiester bonds. These bonds connect the 3'-hydroxyl group of one nucleotide to the 5'-phosphate group of the subsequent nucleotide, forming the sugar-phosphate backbone.
Step 2: Other bond types explained.
Hydrogen bond (Option B): These bonds occur between complementary nitrogenous bases (e.g., A-T, G-C) in double-stranded DNA, not within a single strand.
Glycosidic bond (Option C): This bond connects the sugar and nitrogenous base within a nucleotide.
Covalent bond (Option D): This is a broad classification; phosphodiester bonds are a specific instance of covalent bonds. \[ \therefore \text{The correct answer is: Phosphodiester bond.} \]