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6. It is important to use antibiotics carefully because:
- antibiotics could kill harmless viruses as well as harmful ones
- over-use can lead to the development of resistant bacteria
- antibiotics are very expensive
7. What is a 'pathogen'?
- A disease-causing microorganism
- A disease
- A type of disease
8. What can vaccination involve?
- Injecting an inactive form of the disease to stimulate immunity
- Injecting an inactive form of the pathogen to stimulate immunity
- Injecting a dead form of the disease to stimulate immunity
9. Which of these is one of the main problems with viruses?
- hey cause cholera and typhoid in refugee camps
- They damage the host cell when they reproduce
- They are killed by antibiotics
10. What is one of the functions of white blood cells?
- White blood cells ingest and destroy pathogens
- White blood cells produce antigens that destroy pathogens
- White blood cells carry oxygen in the bloodstream
11. Which of the following is a function of antibodies?
- To lock on to antigens
- To produce toxins
- To engulf pathogens
12. What is it best to have for a healthy heart?
- A lot of cholesterol in the diet
- A high proportion of HDL compared to LDL
- A low proportion of HDL compared to LDL
13. After exercise;
- the metabolic rate stays permanently low
- the metabolic rate stays high for a while
- the metabolic rate stays permanently high