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6. It is important to use antibiotics carefully because:

  • antibiotics are very expensive
  • it reduces the spread of resistant strains
  • it reduces the spread of resistant strains

7. Which of the following is a function of antibodies?

  • To engulf pathogens
  • To lock on to antigens
  • To produce toxins

8. Which of these is one of the main problems with viruses?

  • They damage the host cell when they reproduce
  • They cause cholera and typhoid in refugee camps
  • They are killed by antibiotics

9. What can vaccination involve?

  • Injecting a dead form of the disease to stimulate immunity
  • Injecting an inactive form of the pathogen to stimulate immunity
  • Injecting an inactive form of the disease to stimulate immunity