Why Isn't Bacterial DNA Digested by the Restriction Enzymes Bacteria

question 21

Multiple Choice

Why isn't bacterial DNA digested by the restriction enzymes bacteria produce?

• A)The sequence recognized and cleaved by a restriction enzyme is not found in the bacterial genome.
• B)Bacterial cells have high concentrations of ligase which immediately repairs the any sites that are cleaved.
• C)Methyl groups added to the bases of restriction enzyme recognition sites within the bacterial chromosome block cleavage.
• D)Bacterial DNA is modified with phosphate groups that prevent the function of restriction enzymes.
• E)Restriction enzymes are found in the cytoplasm and DNA is only in the nucleus.

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