Bacterial DNA replication requires the enzyme gyrase, but eukaryotic replication does not. Ciprofloxacin (ʺCiproʺ) inhibits gyrase activity. This is an example of

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Ciprofloxacin targets bacterial gyrase, an enzyme not present in eukaryotic cells, thus selectively affecting bacteria without harming eukaryotic cells. This is an example of selective toxicity.

Bacterial DNA Replication Requires the Enzyme Gyrase, but Eukaryotic Replication