问题 问答题 简答题

简述线粒体基粒的结构和功能。

答案

参考答案:

基粒位于线粒体内膜和嵴上,也称ATP酶复合体。含有头部、柄部和基片三部分。1)头部:球形。为可溶性ATP酶(F1),也称耦联因子F1,头部具有ATP酶活性,催化ATP的合成。此外在头部还有一个多肽,称为ATP酶复合体抑制多肽,可能具有调节酶活性的作用。2)柄部:杆状,为寡霉素敏感的蛋白(OSCP),其作用是调控质子通道。3)基片:疏水蛋白,又称耦联因子Fo,是耦联磷酸化抑制剂寡霉素或二环已基亚胺(DCCD.作用的部位,它能传递质子,有质子通道的作用。

选择题
单项选择题

A narrowing of your work interests is implied in almost any transition from a study environment to managerial or professional work. In the humanities and social sciences you will at best reuse only a fraction of the material (1) in three or four years’ study. In most career paths academic knowledge only (2) a background to much more applied decision-making. Even with a " training " form of degree, (3) a few of the procedures or methods (4) in your studies are likely to be continuously relevant in your work. Partly this (5) the greater specialization of most work tasks compared (6) studying. Many graduates are not (7) with the variety involved in (8) from degree study in at least four or five subjects a year to very standardized job (9) . Academic work values (10) inventiveness, originality, and the cultivation of self-realization and self-development. Emphasis is placed (11) generating new ideas and knowledge, assembling (12) information to make a " rational " decision, appreciating basic (13) and theories, and getting involved in fundamental controversies and debates. The humanistic values of higher (14) encourages the feeling of being (15) in a process with a self-developmental rhythm. (16) , even if your employers pursue enlightened personnel development (17) and invest heavily in " human capital " —for example, by rotating graduate trainees to (18) their work experiences—you are still likely to notice and feel (19) about some major restrictions of your (20) and activities compared with a study environment.

20()

A.hobbies

B.interests

C.subjects

D.concerns