本题目来源于试卷: Interaction & Interdependence C.7 Defence Against Disease，类别为 IB生物学
[单选题]
This diagram shows the interac / /lhj8k8yw) (irh*glqfnwu4tion between a zzkvi +tm(712.x )v 1 oan/sj4tym ggc helper T-cell and a B-lymphocyte.
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What is particle X?
A. Histamine
B. Antibody
C. Antigen
D. Killer T-cell
参考答案: C
本题详细解析:
Choice C is correct because antigens activate Helper T-cells when1huk0m 0gnc3v they bind to them and these then activate B lymphocytes. Choice A is incorrect because histamine is produced by mast cells. Choice B is incorrect because antibodies are proteins produced by B-lymphocytes. Choice D is incorrect because killer T-cells are white blood cells that destroy icvmg3n0k01h unfected body cells.
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