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What is the natural defensive role of restriction enzymes against bacteriophages?

Answer and explanation

Correct answer: They cut invading phage DNA

Restriction enzymes are part of the defence system of many bacteria. When foreign DNA, such as DNA injected by an invading bacteriophage, enters the cell, a suitable restriction endonuclease recognises a particular nucleotide sequence and cleaves the DNA, often producing defined ends. This cleavage can prevent the phage genome from being replicated and expressed. Therefore option A is correct because it directly describes cutting phage DNA. Option B is biologically unrelated, while options C and D describe impossible transformations and are not functions of restriction enzymes. In genetic engineering, the same cutting ability is used deliberately to prepare DNA fragments for cloning.

Related tags

Restriction EnzymesPhage DnaBacterial DefensePrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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