Question : What is the function of restriction endonuclease inside the host bacterial cell? How do bacteria prevent their own DNA from being cut by endonucleases.

Question : What is the function of restriction endonuclease inside the

1.	Question : What is the function of restriction endonuclease inside the host bacterial cell? How do bacteria prevent their own DNA from being cut by endonucleases.
Answer» Solution :RESTRICTION endonucleases present in bacteria provide a defence mechanism against INVADING viruses. Inside the BACTERIAL cell, these enzymes selectively CUT up foreign DNA. Host DNA ismethylated by a modification enzyme (a methylase) to protect it from the restriction endonuclease activity. Therefore, bacteria prevent their own DNA from being cut by endonucleases.