Immunity and the evolutionary race Quiz
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5 questions, one answer each
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1. A baby receives antibodies from the placenta. What type of immunity is this?
- A. Artificial active
- B. Natural active
- C. Natural passive
- D. Artificial passive
2. Why does passive immunity not last long?
- A. The antibodies are broken down and no memory cells are made
- B. The antibodies mutate
- C. T helper cells destroy them
- D. Plasma cells stop dividing
3. Which feature allows influenza to cause repeated epidemics?
- A. A polysaccharide capsule
- B. Survival inside macrophages
- C. Antigenic variation
- D. Destruction of T helper cells
4. How does Mycobacterium tuberculosis survive inside macrophages?
- A. It destroys lysosomes in the cytoplasm
- B. It makes the macrophage stop making antigens
- C. It lacks a cell wall
- D. It prevents lysosomes fusing with the phagosome
5. What best describes the 'evolutionary race' between pathogen and host?
- A. Pathogens mutate when they need to
- B. Hosts and pathogens evolve in response to each other's selection pressure
- C. Hosts evolve faster than pathogens
- D. Pathogens lose genes over time