Oxford AQA IGCSE · CORE Biology (9221)
4 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Infection and response.
Antibiotics such as penicillin are used to treat bacterial infections. However, their overuse has led to the emergence of resistant strains like MRSA.
Which statement correctly explains the natural selection of antibiotic resistance in a bacterial population?
A patient is infected with a new strain of a pathogen that has arisen through mutation. Explain why previously administered vaccinations may no longer be effective against this specific strain.
Pathogens such as bacteria and viruses cause disease in different ways. How do viruses typically cause damage to the human body according to the OxfordAQA syllabus?
The human immune system provides protection against pathogens. When a person is vaccinated, how does the body develop immunity to a specific disease?
Explain how phagocytosis helps the body defend against bacterial pathogens that have entered the bloodstream.
Write your answer out first, then check it against the worked solution.
Explain why antibiotics are effective against bacterial pathogens like MRSA but cannot be used to treat viral infections, and describe the risk associated with the overuse of these medicines.
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Explain why antibiotics, which are effective against bacterial infections like penicillin, cannot be used to treat diseases caused by viral pathogens.
Write your answer out first, then check it against the worked solution.
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