Bacteriophages vary in their ability to infect different strains of bacteria.This is because some bacteria contain _________ __________ that cut the phage DNA after it enters the cell.

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Restriction endonucleases are enzymes that recognize specific DNA sequences and cleave the DNA at or near those sequences. Some bacteria have restriction endonucleases that recognize and cut foreign DNA, such as that of bacteriophages. This is part of the bacterial immune system that protects the cell from invasion by foreign DNA. Different bacteria may have different restriction endonucleases, which can restrict the ability of certain bacteriophages to infect them.

Bacteriophages Vary in Their Ability to Infect Different Strains of Bacteria.This