How does a bacterium protect its DNA from cleavage by its own restriction nuclea

Question

How does a bacterium protect its DNA from cleavage by its own restriction nucleases ?

A. DNA ligase quickly reseals target sequence when they are cut

B. protiens attach to the restricition nuclease target sequence thereby preventing restriction nucleases from binding

C. The bacterium chemically modifies its own DNA, thereby preventing recognition by the retriction endonucleases

D. For a short time the bactwerium turns off all its genes encoding for restriction nucleases

E. The bacterium relaxes its DNA helix

Explanation / Answer

C is the answer (the bacterium chemically modifies its own DNA, thereby preventing recognition by the restriction endonucleases) because the bacteria modifies its own DNA by adding a methyl group at the cleavage site by the enzyme methylase.

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