A-LevelBiologyImmunity9700/12 · Oct/Nov 2013 · Q361 Mark
Which is a correct description of different types of immunity? [Figure 36.1]
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Anatural active: antibodies cross the placenta, natural passive: injection of antigens, artificial active: injection of antibodies, artificial passive: no memory cells form
Bnatural active: memory cells form, natural passive: antibodies cross the placenta, artificial active: injection of antigens, artificial passive: injection of antibodies
Cnatural active: injection of antibodies, natural passive: memory cells form, artificial active: antibodies cross the placenta, artificial passive: injection of antigens
Dnatural active: injection of antigens, natural passive: injection of antibodies, artificial active: no memory cells form, artificial passive: antibodies cross the placenta
✓ Correct answer
B: natural active: memory cells form, natural passive: antibodies cross the placenta, artificial active: injection of antigens, artificial passive: injection of antibodies
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