第13题: [单项选择]MHC限制性表现于 A. NK细胞杀伤作用 B. ADCC作用 C. T细胞对抗原的识别过程 D. B细胞对TI抗原的识别 E. 补体依赖的细胞毒作用 参考答案:C 答案解析:在TCR特异性识别APC所提呈的抗原肽过程中,必须同时识别与抗原肽结合成复合物的MHC-Ⅰ类分子,才能产生T细胞激活信号,即MHC限制性。
第25题: [单项选择]By the end of last week. 611 people from 49 countries () to attend the meeting, with nearly half coming from the United States, Germany and Britain. A. had registered B. have registered C. registered D. were registered 参考答案:A