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6. what bond forms between the heavy chains in an antigen?

  • Hydrogen (lots of)
  • Disulfide Bridges
  • Ionic
  • Ester

7. what do the cells in the cell mediated response differentiate into?

  • Killer t cells, memory cells, suppresor t cells, helper t cells
  • memory cells, cytotoxic t cells, helper t cells, suppressor b cells
  • memory t cells, antibodies, helper t cells

8. what type of antigens generate an immune response?

  • foreign
  • toxins
  • pathogens

9. an antibody has two binding sites, true or false?

  • true
  • false

10. which of these is correct?

  • both B and T cells are activated by antigens
  • T cells activate B cells
  • B cells activate T cells

11. what is a pathogen?

  • an organism that causes disease
  • the way that a disease is transmitted
  • a group of antigens

12. how is HIV spread?

  • on a parasite - particularly a mosquito
  • airbourne
  • bodily fluids
  • food

13. what is passive immunity?`

  • when a person is given antibodies
  • when the immune system responds to an antigen
  • when the immune system responds to an antigen by producing specific antibodies against the antigen

14. what is active immunity

  • when the immune system responds to an antigen by producing antibodies specific to the antigen
  • when a person is given antibodies
  • when the immune system responds to an antigen

15. why are antibiotics ineefective against viruses?

  • the virus' protein coat is too thick to be broken down by antibiotics
  • they are not living
  • it would do more damage to the body than good
  • they are too powerful

16. what are antigens?

  • molecule that prevents illness
  • molecules that generate an immune response
  • biological molecule that acts as the defence for the body
  • molecules that initiate diseases

17. what is the function of a helper T cell

  • activate and stimulate phagocytes and cytotoxic T cells
  • secrete antibodies
  • kills abnormal or foreign molecules

18. what do memory t cells do

  • remember a specific antigen and recognise it the second time round
  • remember the shape of the variable region and allocate antigens to the correct region
  • connect to the hinge region of an antibody and help it to memorise the shape need to fit its variable regio

19. when does full blown AIDS occur?

  • when b cells are not activated and antibodies aren't produced
  • when all helper t cells are infected
  • when white blood cells are no longer produced

20. what are the disease which are caused from AIDS called?

  • opportunistic diseases
  • secondary diseases
  • resulting infections