as biology unit 1

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1. what 2 ways do pathogens cause disease

  • production of toxins and cell damage
  • production of toxins and replicating inside cells
  • blocking functions of cells and damaging cells
  • damaging cells and invading them
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2. what is antigenic variation

  • flu
  • when pathogens change their surface antigens
  • when pathogens change their surface antibodies
  • vaccine

3. what wbc activates b cells

  • phagocytes
  • antibodies
  • t cells
  • b cells

4. what are the two responses that the immune system is split into

  • humoral and phagocytosis
  • humoral and cellular
  • cellular and globular
  • humoral and globular

5. what is an ethical issue on vaccines

  • they are tested on animals first
  • they are tested on humans first
  • vaccines are really harmful
  • vaccines can cause diseases


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