Question

Sticky ends of two DNA strands are joined by the action of enzyme

• A. DNA ligase
• B. Endonuclease
• C. Exonuclease
• D. DNA polymerase

Answer 1

Answer: (A)

DNA ligase

DNA ligase is an enzyme which can connect two strands of DNA by forming a bond between the phosphate group of one strand and the deoxyribose group on another. Ligation can be performed on lengths of DNA which have “blunt” or “sticky” ends following restriction digests.

So the correct answer is option A.