AQA · Biology · 8461
GCSE Biology: Viral diseases
Infection and response · AQA GCSE Biology (8461), specification point 4.3.1.2. Cards are generated from the exam board's own specification for "Viral diseases", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What are the two main symptoms of measles?
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Fever and a red skin rash.
How is the measles virus spread?
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By inhalation of droplets from sneezes and coughs.
Why are most young children vaccinated against measles?
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Measles is a serious illness that can be fatal if complications arise.
What kind of illness does HIV initially cause?
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A flu-like illness.
HIV can be controlled with ? drugs.
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antiretroviral
Which cells does HIV attack if it is not controlled?
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The body's immune cells.
What is AIDS?
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Late-stage HIV infection, when the immune system is so badly damaged it can no longer deal with other infections or cancers.
Name one way HIV is spread.
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Sexual contact, or exchange of body fluids such as blood (e.g. drug users sharing needles).
What type of organism does tobacco mosaic virus (TMV) infect?
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Plants — many species, including tomatoes.
What visible symptom does tobacco mosaic virus cause on leaves?
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A distinctive 'mosaic' pattern of discolouration.
Why does tobacco mosaic virus reduce plant growth?
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The leaf discolouration reduces photosynthesis, so the plant makes less glucose for growth.
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