What is the Natural Function of Restriction Endonucleases

Question

What is the natural function of restriction endonucleases?
A) regulating bacterial gene expression
B) DNA recombination in vivo
C) defending against viruses that infect bacteria
D) DNA manipulation in vitro

Accepted Answer

Restriction endonucleases naturally function as a defense mechanism in bacteria, protecting them against viral infections by cutting the DNA of invading viruses.