21. The Immune System
Primary and Secondary Response of Adaptive Immunity
Multiple Choice
Multiple ChoicePut the following steps in the correct sequence to elicit an antibody response:
(1) TH cell recognizes B cell.
(2) APC contacts antigen.
(3) Antigen fragment displayed on surface of APC.
(4) TH recognizes antigen on APC is immunogenic.
(5) B cell proliferates.
A
1, 2, 3, 4, 5.
B
5, 4, 3, 2, 1.
C
3, 4, 5, 1, 2.
D
2, 3, 4, 1, 5.
E
4, 5, 3, 1, 2.
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