Question

How does bacteria protect itself from restriction enzymes?

Answer 1

basically bacteria have two type of enzymes one which cut the dna segment and another which add methyl to the dna
So second enzyme help bacteria to block the action of first enzyme(molecular scissors )

Answer 2

Bacteria can defend themselves against infection by bacteriophages using an adaptive immune system called CRISPR-Cas. CRISPR-Cas works through the incorporation of small pieces of DNA (“spacers”), taken from the infecting phage, into a specific spot on the bacterial genome, the so-called CRISPR-locus.