Bacteria protect themselves from viruses by fragmenting viral DNA with ____________?
Correct answer: B. Endonuclease
- A. Ligase
- B. Endonuclease
- C. Exonuclease
- D. Gyrase
Explanation
Restriction endonucleases protect bacteria by cutting invading viral DNA at specific internal recognition sequences, thereby disabling the viral genome. Exonuclease is the likely distractor because it also degrades DNA, but it removes nucleotides from an end rather than making the characteristic internal cuts.
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