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What is the role of restriction in a restriction-modification system?

Answer and explanation

Correct answer: Cutting foreign DNA

In a restriction-modification system, a restriction enzyme cuts specific recognition sequences in foreign, usually unmethylated DNA. This protects bacteria from invading DNA such as bacteriophage DNA. Replication of host DNA is not the role of restriction; the modification enzyme methylates host DNA and helps protect it from cleavage. Exam tip: restriction means cutting, whereas modification protects the host DNA.

Related tags

Restriction Modification SystemRestriction EnzymeForeign DnaBacterial DefenseDna MethylationRecombinant Dna TechnologyCutting Of DnaProcesses Of Recombinant Dna Technology

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