Defending against infection

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1. What is one of the functions of white blood cells?

  • White blood cells ingest and destroy pathogens
  • White blood cells carry oxygen in the bloodstream
  • White blood cells produce antigens that destroy pathogens
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2. Which of the following is a function of antibodies?

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

3. What can vaccination involve?

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

4. 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

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

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

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