Immunity and disease

Written by Dr. Hira Salman (Biology)

MDCAT · Biology · 7 questions

Name: ____________________ Date: ____________

Antibodies are produced by:
- A Neutrophils
- B Plasma cells
- C Platelets
- D Red blood cells
Which blood group is the universal donor for red blood cells?
- A A negative
- B B positive
- C O negative
- D AB positive
Rhesus incompatibility can cause problems in a pregnancy when:
- A The mother is Rh positive and the fetus is Rh negative
- B The mother is Rh negative and the fetus is Rh positive
- C Both are Rh negative
- D Both are Rh positive
Which cells directly destroy virus-infected body cells?
- A Mast cells
- B Red blood cells
- C Plasma cells
- D Cytotoxic T cells
Which of these is an example of passive immunity?
- A Immunity after having measles
- B Immunity from a booster dose
- C Immunity after a vaccine
- D Antibodies passed from mother to baby through breast milk
Malaria is caused by:
- A A virus
- B A bacterium
- C Plasmodium, a protozoan
- D A fungus
The dengue virus is spread by:
- A Tsetse fly
- B House fly
- C Aedes mosquito
- D Anopheles mosquito

Answer key

1. B, 2. C, 3. B, 4. D, 5. D, 6. C, 7. C

When B lymphocytes are activated they become plasma cells, which make large amounts of antibody.
O negative red cells carry no A, B or Rh antigens, so they are unlikely to be attacked in the recipient.
An Rh negative mother can make antibodies against the Rh antigens of an Rh positive fetus.
Cytotoxic T cells recognise infected cells and kill them.
In passive immunity the antibodies are received ready-made, so the baby makes no memory cells of its own.
Plasmodium is spread by the bite of the female Anopheles mosquito.
Dengue is carried by Aedes mosquitoes, mainly Aedes aegypti.