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Home Q & A Board Biology-Related Homework Help General Biology
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pado pado
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6 years ago
   They are involved in defense against viruses.
   They serve no function in bacteria and are just used as a molecular tool by scientists.
   They are involved in the identification of the bacterium's DNA.
   They are important in DNA replication.
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6 years ago
Restriction enzymes are part of the restriction-modification system; bacteria and Archea developed thus system as a defense against viruses. Bacterial methylases protect the host DNA by methylation in the sequences the restriction enzymes recognize, and the restriction enzymes fail to cleave methylated DNA.

They are involved in defense against viruses.
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