How do bacteria defend against viruses by breaking down viral DNA?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Biology Mcqsbiology-mcqs
Published
11 Apr 2022
Last updated
28 May 2026

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Explanation

Bacteria utilize endonucleases to cut viral DNA at specific sites, thereby neutralizing the invading virus. Ligase joins DNA strands, exonucleases remove nucleotides from DNA ends, gyrase alters DNA supercoiling, and helicase unwinds DNA strands.

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