Which conclusion can be drawn from the text?
Bacteria reproduce quickly, and within a large population a few cells may carry a gene that protects them from a particular antibiotic. When the drug is given, the sensitive bacteria die while the resistant ones survive and multiply. This process, known as selection, explains why resistance spreads faster where antibiotics are used often. Resistance genes can also pass between different bacteria on small rings of DNA called plasmids, so a trait that arises in one species can appear in another. Using antibiotics only when they are needed and finishing the course prescribed by a doctor slows the spread of resistance. However, the drug does not cause the mutation; it only favours bacteria that already have it. Researchers are therefore searching for new antibiotics and for ways to stop bacteria sharing their resistance genes.
Answer and explanation
Correct answer: A. Finishing a prescribed course can help to slow the spread of resistance
- Step 1: The text recommends using antibiotics only when needed and finishing the course. Step 2. The reason given is to slow resistance. Answer: finishing a course can help. Why not the others: the text does not support these claims.
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