Antigens and phagocytosis Quiz
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5 questions, one answer each
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1. Which of these is an antigen?
- A. A protein on the surface of a bacterium that triggers an immune response
- B. An enzyme that digests bacteria
- C. A cell that engulfs pathogens
- D. A vacuole
2. Why do donor organs need a close tissue match with the recipient?
- A. To keep the blood flowing
- B. To reduce the number of foreign antigens that would trigger rejection
- C. To increase the size of the organ
- D. To remove all lysozymes
3. Why must the influenza vaccine be updated each year?
- A. The virus becomes a bacterium
- B. Lysozymes destroy the old vaccine
- C. Mutations change the antigens so memory cells no longer recognise the new strain
- D. Phagocytes use up the vaccine
4. What happens immediately after a phagocyte engulfs a bacterium?
- A. The bacterium is enclosed in a phagosome
- B. The bacterium divides
- C. The phagocyte divides
- D. The nucleus digests it
5. A patient's phagocytes engulf bacteria but they survive inside. The most likely cause is:
- A. The phagocyte cannot recognise antigens
- B. The bacteria have no cell wall
- C. The phagocyte has too many antibodies
- D. Lysosomes do not release lysozymes into the phagosome