GCSE Biology Revision — Antibiotics & Painkillers
Revise Antibiotics & Painkillers for GCSE Biology with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
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What is Antibiotics & Painkillers?
Antibiotics are drugs that kill bacteria or prevent them from growing, but they do not work against viruses. Painkillers are drugs that treat the symptoms of a disease, such as relieving pain, but they do not kill the pathogens themselves. It is important to use antibiotics correctly to prevent the development of antibiotic-resistant bacteria.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The difference between antibiotics and painkillers, and the development of antibiotic resistance, are key concepts.
Step-by-step explanationWorked examples
Worked example
A patient has a bacterial throat infection. A doctor prescribes a course of penicillin. The antibiotic works by inhibiting the formation of the bacterial cell wall, causing the bacteria to die. The patient also takes paracetamol (a painkiller) to relieve the sore throat symptom while the antibiotic gets to work.
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Common mistakes
- 1Using antibiotics for viral infections like colds or the flu. Antibiotics have no effect on viruses, and their misuse contributes to the problem of antibiotic resistance.
- 2Confusing the role of painkillers and antibiotics. Painkillers mask the symptoms, making you feel better, but they don't tackle the underlying cause of a bacterial infection.
- 3Not finishing a prescribed course of antibiotics. Stopping early can allow some bacteria to survive and mutate, potentially leading to a more resistant infection.
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Frequently asked questions
Why can't antibiotics kill viruses?
Viruses reproduce inside host cells, making them difficult to target without harming the body's own cells. Antibiotics work on specific bacterial structures, like cell walls, which viruses do not have.
What is antibiotic resistance?
Antibiotic resistance occurs when bacteria mutate and are no longer killed by an antibiotic. This is a major public health concern as it can make infections much harder to treat.