Question

The restriction enzymes that cut the bacteriophage DNA cannot cut the bacterial chromosomal DNA.

Explain this statement.

Answer 1

B

Step-by-step explanation:

The other guy was confusing :)

Answer 2

The bacteria can cut the viral DNA at its specific restriction site but protect their own chromosomal DNA by modifying its bases and blocking the restriction enzyme. This process is called methylation (adding a -CH3 group) to prevent binding of the enzyme.