Question

Which of the following bonds are formed by action of DNA ligase?

• A. Sugar-phosphate bond
• B. Phosphodiester bond
• C. Phosphate-phoshpate bond
• D. Both (1) and (2)

Answer 1

The correct option is B Phosphodiester bond

The mechanism of DNA ligase is to form two covalent phosphodiester bonds between $3^{\prime }$ hydroxyl end of one nucleotide(acceptor) with $5^{\prime }$ phosphate end of another(donor).Two ATP molecules are consumed for each phosphodiester bond formation.

So, the correct answer is option B.