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4 marksSocial and Preventative Medicine

CAPE Biology Unit 2 · May/June 2026 · Paper 2 · Question 3(b)(ii)

T cells are a type of white blood cell called lymphocytes. T cells, like phagocytes, also destroy pathogens but in a specific manner. Figure 10 shows the results of a study that was conducted to compare HIV viral load (VL), T helper cells (CD4) and T killer cells (CD8) under natural and therapeutic conditions.

Describe the results obtained under natural conditions and therapeutic conditions as shown in Figure 10 on page 20.

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Other parts of this question

  1. 3(a)(i)State what occurs at the stages labelled I–IV in Figure 9.[4 marks]
  2. 3(a)(ii)State the type of immune response that BEST describes phagocytosis.[1 mark]
  3. 3(a)(iii)State TWO reasons why phagocytosis is important.[2 marks]
  4. 3(b)(i)Describe the function of the following types of T cells.[4 marks]
  5. 3(b)(iii)State ONE suitable conclusion that can be made based on the results shown in Figure 10. You MUST give a reason to support your conclusion.[2 marks]
  6. 3(c)(i)State a suitable hypothesis for this experiment.[1 mark]
  7. 3(c)(ii)Suggest FOUR ways that the procedure could have improved.[4 marks]
  8. 3(c)(iii)Discuss TWO biological consequences of the progression of heart disease in Country X. Your response for EACH consequence MUST include one social issue and one…[8 marks]

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