Restriction endonucleases are isolated from some bacteria. Their role in bacteria is

Defence against virus

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Synthesis of proteins

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Act as genetic material

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Help in reproduction

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Solution

The correct option is A Defence against virus
The restriction enzymes are the enzymes which cleave the DNA at specific recognition sites. These enzymes are isolated from the bacteria which produce the enzymes to cleave the viral genome and provide protection against the viral infection.
Thus, the correct answer is option A.

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