Question

Bacteria use restriction enzymes for _______ .

• A. cutting its own DNA as a defense mechanism
• B. cutting DNA of other bacteria
• C. cutting DNA of viruses that invade them
• D. cutting its own DNA during replication

Answer 1

The correct option is C cutting DNA of viruses that invade them

Bacteria use restriction enzymes for their own protection. The viruses which invade the bacteria (bacteriophages) are acted upon by the bacterial restriction enzymes. These enzymes cut the viral DNA into pieces so that viral replication is prevented.