How Do Bacteria Protect Their Own DNA from the Restriction

question 13

Multiple Choice

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.

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