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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