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O Level Biology: Disease and Immunity MCQs — Biology (page 2)

30 multiple-choice questions on O Level Biology: Disease and Immunity from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

26. How do antibodies help phagocytes?

  1. They mark pathogens for phagocytes to engulf
  2. They make phagocytes divide
  3. They produce enzymes
  4. They carry oxygen to phagocytes

Answer: A) They mark pathogens for phagocytes to engulf

Explanation: Antibodies bind and mark pathogens. O Level Biology · Topic 12 Disease and Immunity · 12.3 Immunity

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27. A baby receives antibodies in breast milk. This is

  1. herd immunity
  2. vaccination
  3. passive immunity
  4. active immunity

Answer: C) passive immunity

Explanation: Antibodies come from another person. O Level Biology · Topic 12 Disease and Immunity · 12.3 Immunity

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28. Antigens are

  1. proteins made by lymphocytes
  2. molecules on pathogens with specific shapes
  3. white blood cells
  4. drugs that kill bacteria

Answer: B) molecules on pathogens with specific shapes

Explanation: Antigens trigger antibody production. O Level Biology · Topic 12 Disease and Immunity · 12.3 Immunity

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29. MRSA is an example of

  1. a protoctist
  2. a virus
  3. a vaccine
  4. an antibiotic-resistant bacterium

Answer: D) an antibiotic-resistant bacterium

Explanation: MRSA is resistant to methicillin. O Level Biology · Topic 12 Disease and Immunity · 12.2 Antibiotics

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30. Each antibody is specific because

  1. it is a carbohydrate
  2. it kills all pathogens
  3. its shape is complementary to one antigen
  4. it is made by phagocytes

Answer: C) its shape is complementary to one antigen

Explanation: Antibody shape fits one antigen. O Level Biology · Topic 12 Disease and Immunity · 12.3 Immunity

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