【单选题】当()时,蛋白分子带负电,可结合于阴离子交换剂上;当()时,蛋白分子带正电,可结合于阳离子交换剂上。
【判断题】离子层析柱中当 pH > pI时,蛋白分子带负电,可结合于阴离子交换剂上; 当 pH < pI时,蛋白分子带正电,可结合于阳离子交换剂上。
【简答题】Police in America were looking for a thir-year-old boy, Ben. He was a middle school student. He was lost last Friday night. Ben’s mother went to bed early that evening because she had a bad cold. ...
【单选题】当()时,蛋白质分子带负电荷,可结合于阴离子交换剂上;当()时,蛋白质分子带正电荷,可结合于阳离子交换剂上。
【简答题】Mary is a thir-year-old girl. She had a bad cold yesterday. She didn’t want to eat anything. Her mother took her to see the doctor. The doctor gave her a bottle of medicine and told her to take it...