题干

科学家通过往豚鼠的胰腺腺泡细胞中注射3H标记的亮氨酸来研究分泌蛋白的合成和分泌过程,最终得到实验结果如下图,下列有关该实验的叙述正确的是   

A:该实验的自变量是3H-亮氨酸的供应量

B:该实验应该持续供给3H-亮氨酸

C:参与该过程的膜结构有内质网、高尔基体、线粒体和细胞膜,它们共同构成该细胞的生物膜系统

D:该过程体现了生物膜的结构特性

上一题 下一题 0.0难度 选择题 更新时间:2019-12-10 04:01:54

答案(点此获取答案解析)

D

同类题1

阅读下列短文,从每题所给的A、B、C、D四个选项中选出最佳选项。

(A)

    Yi Jianlian is a popular Chinese basketball player. He entered CBA at the age of 15. In 2005, he became the youngest MVP winner of CBA. From 2007 to 2012, he played in the NBA and spent five seasons there. Now, he will go back to the NBA. He signed a one-year deal(合约) with the Los Angles Lakers.

    He did a good job and that helped him win the honor again. In the Rio Olympic Games, he averaged 20.4 points for China in five games.

 



    You may take buses every day, but do you ever think about painting buses? In Washington, the US, there is such an activity for students. People hold it every year. Last year, it was on Aug.17. Students from 13 high schools competed to paint buses. The buses came from school, churches and some bus companies.

    Last year, the final winner was Avella High School. They painted their bus black with lighter paint to make it look like space. There are many Star Wars characters on the sides of the buses.


    While many Chinese students go abroad to learn Western culture, foreign students come to China. They get close to traditional Chinese culture. This summer,55 students and teachers from Germany came to China and joined a summer camp. They visited several schools in Hefei, Anhui. There they tried to make dumplings and learn calligraphy(书法). To help them know more about China, Chinese students played with them as partners. They led these foreign guests to places of interest.