Interaction & Interdependence C.7 Defence Against Disease (id: 8cd110acc)

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 intx :4 2 1sql om-kg2um/w2nq0brwxy *creraction betw l uh/ct(v(7rween a 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 when they bind to tvwb,f7;qrajpj 80 d; shem and these then activate B lymphocytes. Choice A is incorrect because histamine is produced by maqv j;7 r a0spdjbfw;8,st 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 infected body cells.

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