Bacterial DNA is modified by adding methyl gr | vedclass

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Question

(D) Bacteria possess a defense mechanism known as the restriction-modification system to protect themselves from invading foreign $DNA$ (such as bacte

Vedclass · Accepted Answer

To protect its own $DNA$ from its own restriction enzymes

Vedclass · Answer

(D) Bacteria possess a defense mechanism known as the restriction-modification system to protect themselves from invading foreign $DNA$ (such as bacteriophage $DNA$).They produce restriction endonucleases that cut specific sequences of foreign $DNA$.To prevent these enzymes from cutting their own $DNA$,bacteria add methyl groups $(-CH_3)$ to specific bases within those same recognition sequences on their own genome.This process is called $DNA$ methylation.Therefore,the methylation of bacterial $DNA$ serves to protect the host's genome from being degraded by its own restriction enzymes.

Bacterial $DNA$ is modified by adding methyl groups. Why is this done?

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