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6.3 Monitoring and maintaining health

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Question 3

When a female mosquito bites a person, she injects saliva containing foreign proteins into the skin to prevent the blood from clotting. This triggers a specific immune response in the person's body.

The list below shows five stages in this immune response:

  • A: Helper T cells release chemical signals to activate B cells.
  • B: Plasma cells produce and release specific antibodies that bind to the foreign proteins.
  • C: White blood cells called macrophages engulf the foreign proteins.
  • D: Macrophages present the foreign proteins on their surface to white blood cells called helper T cells.
  • E: Activated B cells divide and differentiate into antibody-producing plasma cells.

Write these stages in the correct order in the boxes below. The first one has been done for you.

C \begin{array}{|c|c|c|c|c|} \hline \mathbf{C} & \quad & \quad & \quad & \quad \\ \hline \end{array} C​​​​​​
[4]
Markscheme

6.3 Monitoring and maintaining health Questions

  1. GCSE
  2. /Biology
  3. /6.3 Monitoring and maintaining health

97 exam-style questions on OCR GCSE Biology 6.3 Monitoring and maintaining health, covering 6.3.1 Health and disease, 6.3.2 Interactions between diseases, 6.3.3 Spread of communicable diseases, 6.3.4 Common infections and diseases, 6.3.5 Physical plant defence responses, 6.3.6 Chemical plant defence responses, 6.3.7 Detecting and identifying plant diseases, 6.3.8 White blood cells and platelets, 6.3.9 Non-specific defence systems, 6.3.10 The immune system, 6.3.11 Monoclonal antibodies, 6.3.12 Vaccines and medicines, 6.3.13 Aseptic techniques, 6.3.14 Discovery and development of new medicines, 6.3.15 Causes of non-communicable diseases, 6.3.16 Treatments for cardiovascular disease, 6.3.17 Lifestyle factors and non-communicable diseases, 6.3.18 Cancer, 6.3.19 Stem cells in medicine, 6.3.20 Gene technology in medicine, and 6.3.21 The human genome and medicine. Each one has a worked solution and a mark scheme showing where the marks go.

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