第15题: [单项选择]In the third paragraph it is mentioned that by means of science ______.are analysed and studied. A. the ways in which cells formed B. changes in organic life C. the main ways in which organisms develop D. processes on which organic life depends 参考答案:D
第27题: [单项选择]一种破伤风类毒素抗体(抗体1)能与发生二硫键全部断裂而变性的破伤风类毒素发生反应;另一种破伤风类毒素抗体(抗体2)不能与因同种原因变性的破伤风类毒素发生反应。对于这一实验结果,最可能解释() A. 抗体1对破伤风类毒素无特异性 B. 抗体2对破伤风类毒素上的构象决定簇有特异性 C. 抗体1对破伤风类毒素的氨基酸序列有特异性 D. 抗体2对二硫键有特异性 E. B和C正确 参考答案:E