Bacteria Produce Many Restriction Endonucleases

question 37

Multiple Choice

Bacteria produce many restriction endonucleases.What prevents these enzymes from degrading the host DNA?

• A)A bacterium will produce endonucleases that recognize sequences that are not present in its own DNA.
• B)The strong association between the histones and bacterial DNA prevent the endonucleases from acting on them.
• C)The endonucleases are transported out of the cell so quickly they cannot significantly affect the host DNA.
• D)The host DNA is specifically methylated and is therefore protected from cleavage.

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