How do bacteria protect their own DNA from the restriction enzymes they produce?
A)Their DNA never contains the recognition site.
B)Ligase connects their DNA as soon as it is cut.
C)Digestion is blocked by methyl groups added to recognition sequences in their DNA.
D)Phosphate groups added to the recognition sequences in their DNA block digestion.
E)Restriction enzymes are blocked from entry into the nucleus.

Question

Quizplus · Accepted Answer

Bacteria protect their own DNA from the restriction enzymes they produce by adding methyl groups to recognition sequences in their DNA, which block digestion by restriction enzymes. This is called methylation and serves as a defense mechanism against the endonucleases.

How Do Bacteria Protect Their Own DNA from the Restriction