A-LevelBiologyImmunity9700/12 · Oct/Nov 2014 · Q361 Mark
The statements refer to polio and tuberculosis (TB). 1 Macrophages present antigens in vaccines to stimulate an immune response. 2 The TB antigens necessary to produce an immune response are proteins which would be digested in the stomach and small intestine. 3 There are no B-lymphocytes and T-lymphocytes in the stomach. Which explains why polio vaccine can be taken by mouth but TB vaccine has to be injected?
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 only
✓ Correct answer
D: 2 only
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