问题
单项选择题
很多酶是以无活性酶原形式合成然后被激活为有活性的酶。下列哪种蛋白水解酶是其酶原经酸激活的
A.胰蛋白酶
B.糜蛋白酶
C.弹性蛋白酶
D.胃蛋白酶
E.羧基肽酶
答案
参考答案:D
很多酶是以无活性酶原形式合成然后被激活为有活性的酶。下列哪种蛋白水解酶是其酶原经酸激活的
A.胰蛋白酶
B.糜蛋白酶
C.弹性蛋白酶
D.胃蛋白酶
E.羧基肽酶
参考答案:D
用方框内所给词的正确形式填空。 | |
is true that students like 2 by watching TV. However, the dangerous thing 3 students is that they just can't take their 4 off the screen. They will go on watching TV for hours 5 hours. It is very bad for their eyes. 6 , many students have a habit of 7 too much TV. Then they have little time left for sports. Third, some TV programs are not 8 for students. Some even lead them to commit crmes (犯罪). Finally, too much TV can 9 students weak in reading. They will lose interest 10 reading, which I think is a terrible thing. |