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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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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