Identify antibiotics that inhibit DNA replication and transcription.

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Multiple Choice

Identify antibiotics that inhibit DNA replication and transcription.

Bacteria rely on specialized enzymes to manage DNA topology during replication. Quinolones target DNA gyrase and topoisomerase IV, enzymes that introduce and relieve supercoils and separate replicated DNA molecules. By inhibiting these enzymes, the enzyme-DNA complexes can become trapped and DNA cannot unwind properly or be decatenated, effectively halting DNA replication and causing lethal DNA damage. That direct interruption of the replication process is why this antibiotic class is the best fit for inhibiting DNA replication. For comparison, rifampin blocks RNA polymerase and transcription, penicillin inhibits cell wall synthesis, and tetracycline disrupts protein synthesis by targeting the 30S ribosomal subunit.

Bacteria rely on specialized enzymes to manage DNA topology during replication. Quinolones target DNA gyrase and topoisomerase IV, enzymes that introduce and relieve supercoils and separate replicated DNA molecules. By inhibiting these enzymes, the enzyme-DNA complexes can become trapped and DNA cannot unwind properly or be decatenated, effectively halting DNA replication and causing lethal DNA damage. That direct interruption of the replication process is why this antibiotic class is the best fit for inhibiting DNA replication. For comparison, rifampin blocks RNA polymerase and transcription, penicillin inhibits cell wall synthesis, and tetracycline disrupts protein synthesis by targeting the 30S ribosomal subunit.

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