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Bacteria That Survive
Age 13 · Biology
Antibiotics kill many bacteria, but a few may survive because of random changes. Those survivors multiply, so later the same medicine may not work as well.
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Age 13: open this week
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In the picture
- White paper disk: the source placed at the center of the dish.
- Clear ring: the area where most bacteria have died and no longer grow.
- Colonies inside the clear ring: the few bacteria that survived near the disk.
- Colonies outside the clear ring: growth that continues on the cloudy film.
Examples
- Taking antibiotics for a cold does not help because colds are caused by viruses, and unnecessary antibiotics can encourage resistant bacteria.
- Stopping antibiotics early can leave some bacteria alive, and they may multiply and make the infection harder to treat later.
Key takeaways
- Antibiotic resistance happens when surviving bacteria reproduce.
- Using antibiotics only when needed helps slow resistance.
Quiz: Bacteria That Survive (Age 13)
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According to the card, what causes antibiotic resistance to develop?
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Why might the same medicine not work as well later?
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What helps slow the development of antibiotic resistance?
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