Describe the role of T cells in the immune responce The graph in Figure 2 shows the development of an infection with Human Immunodeticiency Virus (HIV) over a period of ten years with changes in the number of a type of T lymphocyte. Ta cells are aiso shown. Key HIV T4 cells 10 Time/years Describe the changes in the number of HIV partides over the 10-year period. Describe TWO ways in which the curve for the T4 cells differs from that for the HIV particles Suggest an explanation for the differences between the number ef T4 cefls in the blood and the number of HIV particles ever the periad. Number of T4 cells (lymphocytes in blood) Number of HIV particles

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KEY: Hydrophobic interactions: Salt bridge: Covalent bonds: Hydrogen bonding: Metal ion coordination: 9. 10What components of the plasma membrane might you drug interact with? Explain can use as many components as you need (may need more or less). Component 1 and why: Component 2 and why: Component 3 and why:

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