Question

Knife of DNA is:

• A. DNA−ligase
• B. Restriction enzyme
• C. DNA polymerase
• D. Peptidase

Answer 1

The correct option is B Restriction enzyme

Restriction enzyme is a protein produced by bacteria that cleaves DNA at specific site along the molecule. Restriction enzyme cuts the DNA double helix in a very precise way. It cleaves DNA into fragments at or near specific recognition sites within the molecule known as restriction sites. Hence, restriction enzyme is also called as 'molecular scissor' or 'knife of DNA'.