第14题: [单项选择]G蛋白所指的酶或蛋白质是 A. 蛋白激酶A B. 鸟苷酸环化酶 C. 蛋白激酶G D. 生长因子结合蛋白-2 E. 鸟苷酸结合蛋白 参考答案:E 答案解析:本试题主要考查考生对G蛋白分子组成、酶催化性质及上下游分子的关系的掌握情况。
G蛋白是由α、β、γ亚基组成并结合GDP,因此也属于鸟苷酸结合蛋白,其中α亚基具有内在GTP酶活性,将GTP水解成GDP
第16题: [单项选择]What is the man doing () A. He’s going to find an apartment for himself. B. He’s going downtown with his brother. C. He’s already found an apartment. D. He’s helping his brother look for an apartment. 参考答案:D 答案解析:
第18题: [填空题]A tell information about a delivery B change the schedule C give an invitation D make a complaint E place an order F make an announcement G postpone a session H inform of the success of a presentation_________ 参考答案:A 答案解析:[听力原文] Man: I’ve checked with the Warehouse Manager and it seems there was a mistake in the trans